Specifications : GENERAL Rated Power 5000VA / 5000W Communication Interface Removable USB / RS232 / RS485 / Bluetooth / Dry-contact Dimension D x W x H (mm) 115 x 300 x 400 Net Weight (kgs) 13 INPUT Voltage 230VAC Selectable Voltage Range 170 ~ 280 VAC (For Personal Computers)90 ~ 280 VAC (For Home Appliances) Frequency Range 50Hz / 60Hz (Auto sensing) OUTPUT AC Voltage Regulation (Batt. Mode) 230VAC ± 5% Surge Power 10000VA Efficiency (Peak) 90% ~ 93% Transfer Time 15 ms (For Personal Computers)20 ms (For Home Appliances) Waveform Pure sine wave BATTERY Battery Voltage 48VDC Floating Charge Voltage 54VDC Overcharge Protection 63VDC SOLAR & AC CHARGER Solar Charger Type MPPT Maximum PV Array Open Circuit Voltage 500VDC Maximum PV Array Power 5000W MPP Range @ Operating Voltage 120VDC~450VDC Maxmum Solar Charge Current 100A Maximum AC Charge Current 100A manufacturer link
APC UPS Accessories SRVRK1 APC Easy UPS RAIL KIT, 700MM, 1 – 10KVA (Rackable SRV models)
PCE EX Online 2 KVA 1800W is a double-conversion online UPS designed to deliver continuous and stable power protection for computers, servers, and sensitive electronic equipment. It ensures uninterrupted operation during outages and unstable voltage conditions. In addition, PCE EX Online 2 KVA 1800W uses true online double-conversion technology. Therefore, it provides zero transfer time between mains and battery mode. Moreover, it delivers a pure sine wave output for safe and stable power to connected devices. Furthermore, PCE EX Online 2 KVA 1800W supports a 2kVA / 1800W load capacity. As a result, it can handle multiple devices such as PCs, routers, and small servers. It also maintains stable voltage regulation for sensitive workloads. In addition, PCE EX Online 2 KVA 1800W includes advanced protection features. Therefore, it helps protect against overload, short circuits, and power fluctuations. Moreover, it is designed for consistent performance in professional and office environments. Overall, PCE EX Online 2 KVA 1800W delivers reliable, uninterrupted, and high-quality backup power for critical systems. Specifications: 2kVA / 1800W power capacity for multiple devices Online double-conversion UPS technology Zero transfer time for uninterrupted power Pure sine wave output for safe device operation Protection against overload and voltage fluctuations
Vertiv Emerson Liebert itON LI32121CT00 800VA
APC Easy UPS On-Line SRV 3000VA 230V SRV3KI is a high-performance uninterruptible power supply designed to provide continuous power protection for servers, network equipment, data centers, and critical business systems. It uses true online double-conversion technology to deliver clean and stable power in demanding environments. The UPS provides 3000VA / 2400W power capacity. Therefore, it can support critical equipment during power outages, voltage fluctuations, and electrical disturbances. In addition, it helps maintain business continuity and equipment reliability. It features online double-conversion technology that continuously conditions incoming power. As a result, connected devices receive consistent and clean power regardless of utility power quality. The unit includes an LCD display for real-time monitoring and system management. Meanwhile, automatic bypass functionality helps maintain power delivery during specific operating conditions and maintenance events. APC designs the Easy UPS On-Line series for dependable power protection and efficient operation. Therefore, this model is ideal for servers, network infrastructure, security systems, and mission-critical applications. manufacturer link Specifications: 3000VA / 2400W power capacity Online double-conversion technology Pure sine wave output LCD status and monitoring display Reliable backup for critical systems
Key Features Output Connections (1) IEC 60320 C19 Input Connections Schuko CEE 7 / EU1-16P Cord Length 8.2ft (2.5meters) Power Cord, C19 to CEE/7 Schuko, 2.5m Wide selection of Rack PDU power cords for a variety of IT equipment. Specifications : Output Overload Protection No Maximum Total Current Draw 16 Input Input frequency 50/60 Hz Acceptable Input Voltage 90 – 250VAC Number of Power Cords 1 Maximum Input Current 16A Maximum Line Current 16A Physical Net Weight 0.49lbs. (0.22KG) Shipping weight 0.66lbs. (0.3KG) Shipping Height 2.01inches (51MM, 5.1CM) Shipping Width 4.02inches (102MM, 10.2CM) Shipping Depth 7.99inches (203MM, 20.3CM) Color Black Environmental Operating Temperature 32 – 113 °F (0 – 45 °C) Operating Relative Humidity 0 – 95 % Operating Elevation 0 – 10000ft (0 – 3048meters) Storage Temperature -25 – 65 °C Storage Relative Humidity 0 – 95 % Storage Elevation 0 – 50000ft (0 – 15240meters) manufacturer link
UPS PCE EXDC-2 MAX UPS Adapter for Cameras & Modems
Features and performances x Outstanding efficiency and overload. x Perfect management and limitation of AC sources. x Power shaving of the consumption peaks. x Automatic allocation of the power available. x Active filtering of the load steps on the genset. x Automatic protection of the sources against overload. x Powerful multi-stage PFC charger. x Ultra-short transfer time (from 0 to 15ms max.). x Automatic and efficient stand-by. x Compatible with AC coupling. x Display, programming and data logging. x RS-232 communication for remote supervision. x iPS Dim. : 44.50x20x17.2( LxWxH cm ) , 17.50 x 7.87×6.8 ( LxWxH inch) x Carton box Dim.: 53.5×30.5×30.5 (LxWxH cm) , 21.65×11.8×12 (LxWxH inch) x Weight : 25Kg ( 55lbs ) Model iPS 3700-24 Inverter Nominal battery voltage 24V Input voltage range 19 – 34V Continuous power @ 25°C 2000W Power 30 min. @ 25°C 2800W Power 25 sec. @ 25°C 5.6kVA Maximum load Up to short-circuit Maximum asymmetric load Up to Continuous power Load detection (stand-by) 2 to 25 W Maximum efficiency 86 – 90% Consumption OFF/Stand-by/ON 3W / 9W / 70W Output voltage Sine wave 220Vac (+/- 2%) / 190-245Vac Dynamic behavior 5 ms (on load change 0 to 100%) Overload and short-circuit Automatic disconnection up to 10 times restart attempt Overheat protection Warning before shut – with automatic restart Battery charger 6 step adjustable : I-U-Uo-Equalize-Uo(low)-U(periodic) Charging current adjustable 0 – 45A Maximum input voltage 265Vac Input AC voltage range Adjustable threshold from 150 to 265Vac Battery control Absorption end By duration 2 / 0.25 – 10 h or by current – / 4 – 30A Absorption voltage** 28.8 / 19 – 34V Periodic absorption voltage** 19 – 34V Floating voltage** 27.2 / 19 – 34V Reduced floating voltage 19 – 34V Equalization** By number of cycles (1 – 100) or at set interval (52 weeks) Equalization end By duration 4 / 0.25 – 10 h or by current – / 4 – 30A Deep-discharge protection 21.6 / 19 – 34V Reduced floating time 0 – 32 days Periodic absorption time 0 – 10 hours General data iPS 3700-24 Auxiliary Output 2 independent Transistor short circuit protected outputs Auxiliary Input 2 Opto Coupler Programmable Input 10V Æ 60VDC Net Weight 25Kg ( 55lbs ) Weight with the cartoon box 26.2Kg (57.5lbs) 1 Year warranty
The Beco GP600 600VA 360W UPS delivers reliable power protection for home and office devices. It keeps your electronics safe during outages and voltage drops. This UPS helps prevent data loss and sudden shutdowns, providing peace of mind every day. Moreover, the Beco GP600 600VA 360W UPS features 600 VA capacity with up to 360 W output power. It supports computers, routers, modems, and monitors effortlessly. Devices continue running smoothly during short power interruptions. This improves system stability. In addition, the UPS includes built-in surge protection for safe operation. It guards connected devices against spikes and surges. This adds an extra layer of defense during storms or unstable power conditions. Safety remains a priority. Furthermore, the Beco GP600 600VA 360W UPS offers battery backup that keeps equipment running long enough to save work. This prevents data corruption during sudden outages. Users can shut down systems properly. Protection feels dependable. Also, the unit delivers stable voltage regulation without manual adjustment. It corrects fluctuations automatically. This improves device performance and lifespan. Steady power enhances everyday use. In addition, the Beco GP600 600VA 360W UPS includes easy-to-read LED indicators. They show power and battery status at a glance. Users stay informed without confusion. Monitoring becomes simple and quick. Moreover, the UPS features multiple outlets for connecting several devices at once. This increases flexibility for workstations and entertainment setups. You can protect more devices with one unit. Furthermore, the Beco GP600 600VA 360W UPS supports simple installation without complicated steps. Setup is quick with clearly marked connections. This helps both beginners and experienced users. Also, the compact design fits well on desks or shelves without taking much space. It blends into home and office environments easily. Portability stays practical. Overall, the Beco GP600 600VA 360W UPS delivers dependable battery backup, surge protection, and steady power. It protects vital electronics and supports uninterrupted use. This UPS is ideal for users seeking reliable power protection every day. Specifications: 600VA, 360W, LED, Plastic Case Input: 145-290 VAC Output: 230VAC 50/60HZ 12V 7AH *1pc, Universal Socket *2 + EU Plug With AVR, Bypass output Overload and short circuit protection
APC Easy UPS SRV, 1600 Watts / 2 KVA, Online double conversion, Sine wave, 230V, Multi-function LCD status and control console, Surge Protection and Filtering, Generator compatible, Management Software, USB, 2 years warranty Electronics and Battery
The APC Smart-UPS RC 800W 1KVA Sine Wave SRC1KI provides reliable backup power for critical devices. First, it delivers pure sine wave output, ideal for sensitive electronics. In addition, the UPS protects connected equipment from power surges, spikes, and outages. Moreover, it features a compact design for easy placement in offices or server rooms. Finally, the unit includes an intuitive LCD interface for monitoring battery status and load. The SRC1KI ensures continuous operation and safeguards important systems during power interruptions. Specifications: 800W / 1KVA pure sine wave output for sensitive devices Protects against power surges, spikes, and outages Compact design for office or server room placement LCD interface for monitoring battery and load status Ensures continuous operation during power interruptions
The PCE PCD 12V 65Ah Deep Cycle Battery delivers dependable power for a wide range of applications. It provides stable energy over long discharge cycles. This battery supports regular use in marine, RV, solar, and backup power systems. It fits well where lasting performance matters. Moreover, the PCE PCD Deep Cycle Battery features a deep cycle design for long life and strong reliability. It tolerates repeated charging and discharging without damage. This increases uptime and reduces maintenance needs. Users enjoy continuous power without frequent replacements. In addition, the battery delivers 12 V and 65 Ah capacity for steady power delivery. This suits medium and high demand systems. Appliances, lights, and electronics receive reliable current. It helps systems stay stable in everyday use. Furthermore, the PCE PCD 12V 65Ah Deep Cycle Battery includes sturdy construction for long-lasting durability. The strong casing protects internal cells against wear and tear. This adds confidence in heavy use environments. Performance remains consistent over time. Also, the battery supports deep discharge recovery for extended service life. It recovers well even after heavy drain cycles. In addition, the PCE PCD Deep Cycle Battery is easy to install in many setups. It fits most battery holders and racks without fuss. Connections remain secure and simple. Furthermore, the PCE PCD Deep Cycle Battery supports stable performance in varying temperatures. It remains reliable in moderate heat and cold. This helps outdoor and mobile applications. Overall, the PCE PCD 12V 65Ah Deep Cycle Battery delivers strong power, lasting durability, and smooth performance. It fits home, marine, solar, and backup use. This battery is ideal for users who want dependable deep cycle energy every day. Specifications: Voltage : 12V Capacity : 65Ah
Features • Advanced DSP and 3-level technology • Output power factor 1.0 • Active power factor correction (APFC), input power factor up to 0.99 • High efficiency 95% (up to 98% in ECO mode) • Advanced digital parallel technology • Wide input voltage range (11 0 – 288 Vac) and frequency range (40 -70Hz) • 50 I 60 Hz frequency auto sensing • Two modes of frequency conversion: 50 Hz input I 60 Hz output or 60 Hz input I 50 Hz output • Dual-input design, supporting independent bypass • Flexible battery configuration (settable 16-20 pes batteries) • Digitally controlled charger • High charging current available (Max. 12 A) • Charging voltage and current configured by demands • Linear derating in low voltage input reducing battery discharging times, extending the service life of battery • Intelligent battery management, automatic floating I equalizing charge control, charger dormancy control, increasing battery life by 50%• Ability to switch on the UPS with batteries • Settable delayed start time when mains power is restored, reducing the impact on power grid or generator • Fan speed varies intelligently with temperature, reducing noise and extending its service life • Equipped with self-aging function • Compact internal layout, miniaturized the complete unit for small footprint • LCD+LED display, multi-functional keys operation, friendly human-machine interface • Powerful background software for parameters configuration • Advanced multi-platform communications: RS232, USB, RS485, SNMP and dry contacts communication interfaces • Effective software and hardware protection function, robust self-diagnostic function, and abundant event log for check Available Options • RS232 and smart card slot included • Optional parallel function, battery temperature compensation, SNMP card, USB, RS485 card, dry contacts, EMD, and SMS alarms Rear Panel 1. RS232 2. EPO 3. Parallel Port (optional) 4. USB (optional) 5. Temperature Detection (optional) 6. Intelligent Slot 7. Reserved: for manual bypass or battery breaker or outlets ect. 8.Fans 9. Bypass Breaker 10. Input Breaker 11.GND 12.Terminals and Cover http://en.eastups.com/EA900G4610kVA/6754.jhtml
APC UPS Accessories APV9601 EASY UPS ON-LINE SNMP CARD, 1 – 10KVA (SRV models)
The PCE PCD 12V 100Ah Deep Cycle Battery delivers strong and reliable power for many applications. It offers a larger 100Ah capacity for extended use. This helps engines, systems, and devices run longer between charges. Users experience dependable energy when needed most. Moreover, the PCE PCD Deep Cycle Battery uses a deep cycle design built for repeated discharge and recharge. It supports long-term use without damage. This increases the battery’s lifespan and reduces replacements. Performance remains consistent over time. In addition, the battery provides a stable 12 V output for balanced power delivery. It suits solar systems, RVs, marine setups, and backup power solutions. Power stays steady for lights and appliances. Daily use becomes more efficient. Furthermore, the PCE PCD 12V 100Ah Deep Cycle Battery features a rugged casing that protects internal cells. The strong build resists wear and harsh conditions. This helps maintain performance in many environments. Durability feels reassuring. Also, the battery supports deep discharge recovery for long service life. It recovers well after heavy use cycles. This improves energy storage and reliability. Users rely on strong power anytime. In addition, the PCE PCD Deep Cycle Battery is easy to install in compatible racks and holders. Connections stay secure and simple. Setup feels user-friendly for both beginners and professionals. Installation remains smooth. Furthermore, the PCE PCD Deep Cycle Battery performs steadily across varying temperatures. It stays reliable in moderate heat and cold. This makes it ideal for outdoor and mobile use. Overall, the PCE PCD 12V 100Ah Deep Cycle Battery delivers dependable power, long life, and robust performance. It fits homes, boats, RVs, and solar systems. This battery is perfect for users who want strong, lasting deep cycle energy every day. Specifications: Voltage : 12V Capacity : 100Ah
Specifications : Le grand ups keor spx 600va 310300 UPS 600va
Specifications : Output Max Configurable Power (Watts) 6.0kWatts / 6.0kVA Output Voltage Note Configurable for 220 : 230 or 240 nominal output voltage Efficiency at Full Load 94.0 % Output Voltage Distortion 1 % Output Frequency (sync to mains) 50/60 Hz +/- 3 Hz Sync to mains Other Output Voltages 220 V, 240 V Load Crest Factor 3 : 1 Topology Double conversion online Waveform type Sine wave Bypass Internal bypass (automatic and manual) Input Input frequency 40 – 70 Hz Auto sensing Input voltage range for main operations 110 – 300 Half load, 176 – 300 Full loadV Efficiency at Full Load 94.0 % Other Input Voltages 220 V, 240 V Batteries & Runtime Battery type Lead-acid battery Typical recharge time 7hour(s) Nominal Battery Voltage 192 V Expected Battery Life (years) 3 – 5 Battery Charge Power (Watts) 235 Watts Runtime View Runtime Graph Communications & Management Interface Port(s) DB-9 RS-232, USB Control panel Multifunction LCD status and control console Audible Alarm Alarm when on battery : distinctive low battery alarm : overload continuous tone alarm Emergency Power Off (EPO) Yes Available SmartSlot™ Interface Quantity 1 Surge Protection and Filtering Surge energy rating 600Joules Physical Maximum Height 173MM, 17.3CM Maximum Width 438MM, 43.8CM Maximum Depth 710MM, 71.0CM Net Weight 61.0KG Shipping weight 71.0KG Shipping Height 1232MM, 123.19CM Shipping Width 600MM, 60.0CM Shipping Depth 836MM, 83.6CM Color Black Environmental Operating Temperature 0 – 40 °C Operating Relative Humidity 0 – 95 % Operating Elevation 0 – 3000meters Storage Temperature -15 – 60 °C Storage Relative Humidity 0 – 95 (Non-condensing) % Storage Elevation 0 – 15000meters Audible noise at 1 meter from surface of unit 55.0dBA Online thermal dissipation 1172.0BTU/hr Protection Class IP20 Conformance Approvals CE, EAC, EN/IEC 62040-1, EN/IEC 62040-2, TISI Standard warranty 2 years repair or replace Sustainable Offer Status RoHS Compliant Warranty : 1 year https://www.apc.com/shop/dk/en/products/APC-Easy-UPS-On-Line-SRV-6000VA-RM-230V-with-Rail-Kit/P-SRV6KRIRK
The Beco GP2000 2000VA 1200W UPS delivers dependable power protection for home, office, and business systems. It supports high-demand devices like desktops, servers, and networking equipment. This UPS helps prevent data loss and sudden shutdowns during power interruptions. Users enjoy peace of mind with reliable backup. Moreover, the Beco GP2000 2000VA 1200W UPS features a 2000 VA capacity and 1200 W output power for strong performance. It maintains stable power for multiple connected devices. This helps keep critical systems running longer during outages. Reliability stays consistent. In addition, the UPS includes built-in surge protection for safe operation against voltage spikes. It guards your electronics from unpredictable power surges. This adds extra defense during storms or unstable conditions. Device safety remains a priority. Furthermore, the Beco GP2000 2000VA 1200W UPS offers automatic voltage regulation to smooth dips and spikes. It balances fluctuating power automatically. This strengthens system reliability and helps extend equipment life. Power stays steady without manual changes. Also, the UPS provides battery backup when electricity fails. You can save work and shut down systems properly before power runs out. This reduces risk of data corruption. Backup power feels dependable and secure. In addition, the Beco GP2000 2000VA 1200W UPS includes easy-to-read LED indicators for power and battery status. You can check conditions at a glance. This makes monitoring clear and simple. Users stay informed during operation. Moreover, the UPS supports multiple output sockets for connecting several devices simultaneously. This increases flexibility for desks, workstations, and server setups. You can protect many electronics at once. Furthermore, the Beco GP2000 2000VA 1200W UPS supports easy installation with plug-and-play setup. Connections are marked clearly for simple use. Setup remains quick and stress-free. Also, the compact and sturdy design fits neatly on desks or shelves. It blends into home and office spaces easily. Portability stays practical. Overall, the Beco GP2000 2000VA 1200W UPS delivers strong battery backup, surge protection, and smooth voltage regulation. This UPS is perfect for users needing powerful and reliable power protection every day. Specifications: 2000VA, 1200W, LCD, Plastic Case Input: 140-290 VAC Output: 230VAC 50/60HZ 12V 9AH *2pcs, Universal Socket *4 + EU Plug With AVR, Bypass output Overload and short circuit protection
Specifications : Le grand ups keor spx 1500va fr _310303 UPS 1500va
FANTECH NS12 Laptop Stand is a portable and adjustable stand designed to improve comfort, posture, and laptop cooling. It is suitable for office work, study, and remote setups where ergonomic positioning is important. It offers 16 levels of height adjustment, allowing users to find the most comfortable viewing angle. Therefore, it helps reduce neck and shoulder strain during long hours of use. The stand is built with durable aluminum alloy for strong stability and long-term use. In addition, it supports laptops up to 15.6 inches securely. Its foldable design makes it easy to carry and store in a bag. Moreover, the included free pouch improves portability for travel and daily commuting. The open-frame structure enhances airflow around the laptop. As a result, it helps improve cooling performance during heavy use. Specifications: 16-level height adjustment system Durable aluminum alloy construction Supports laptops up to 15.6 inches Foldable portable lightweight design Free carrying pouch included
FANTECH NS10 Lifting Laptop Stand Silver is a height and angle adjustable stand designed to improve comfort, posture, and airflow during laptop use. It is suitable for office work, study, and home setups. It allows flexible adjustment of height and viewing angle to match user preference. Therefore, it helps reduce neck and shoulder strain during long working hours. The sturdy aluminum-style frame provides stable support for laptops of different sizes. In addition, it keeps the device secure during typing and daily use. Its open design improves ventilation around the laptop. Moreover, this helps reduce heat buildup and supports better cooling performance. The lightweight and foldable structure makes it easy to carry and store. As a result, it offers a practical ergonomic solution for everyday use. Specifications: Max Weight Load : 10 KG Material : Steel Size : 259 x 225 x 43mm Weight : 1440 Compatibility : Laptops or Tablets up to 17 inches
FANTECH NS11 Portable Aluminum Laptop Stand is designed to improve comfort, posture, and airflow while using a laptop. It is suitable for office work, study, and remote setups. It features an adjustable height and angle design that allows users to position their laptop at a more ergonomic viewing level. Therefore, it helps reduce neck and back strain during long working sessions. The stand is made from durable aluminum alloy for strong support and long-lasting use. In addition, it provides stable holding for laptops up to 15.6 inches. Its foldable and lightweight design makes it easy to carry and store. Moreover, the included free pouch adds convenience for travel and portability. The open structure improves ventilation and helps prevent laptop overheating. As a result, it offers a practical solution for comfortable and efficient laptop use. Specifications: Adjustable height and viewing angle Durable aluminum alloy construction Supports laptops up to 15.6 inches Foldable portable lightweight design Includes free carrying pouch
FANTECH NS10 Lifting Laptop Stand is a compact and adjustable stand designed to improve comfort and ergonomics during laptop use. It is suitable for office work, study, and home setups. It features height and angle adjustment to help users find a comfortable viewing position. Therefore, it reduces neck and shoulder strain during long working hours. The sturdy frame provides stable support for laptops of different sizes. In addition, it keeps the device secure during typing and daily use. Its open design improves airflow around the laptop. Moreover, this helps reduce heat buildup and supports better cooling performance. The stand is lightweight and easy to adjust, making it practical for everyday use. As a result, it offers a simple and effective ergonomic solution for any workspace. Specifications: Max Weight Load : 10 KG Material : Steel Size : 259 x 225 x 43mm Weight : 1440 Compatibility : Laptops or Tablets up to 17 inches
FANTECH NC21 Cooling Pad is designed to improve laptop cooling performance, comfort, and usability during long gaming or working sessions. It supports efficient airflow with a powerful dual-fan system for stable temperature control. It features large dual fans that deliver strong cooling performance across the laptop base. Therefore, it helps reduce overheating and maintain smoother system performance during heavy use. The stand includes 8 levels of height adjustment for better ergonomic positioning. In addition, it helps reduce neck and back strain by improving viewing angles. A built-in phone holder adds extra convenience for multitasking. Moreover, RGB lighting enhances the gaming setup with a stylish visual effect. Its sturdy design supports stable laptop placement while maintaining effective airflow. As a result, it combines cooling, comfort, and functionality in one setup solution. Specifications: Max Weight Load : 10 KG Material : Steel Size : 259 x 225 x 43mm Weight : 1440 Compatibility : Laptops or Tablets up to 17 inches
FANTECH NC30 Laptop Cooling Stand is designed to improve laptop cooling, comfort, and usability during long gaming or working sessions. It supports laptops up to 17.3 inches, making it suitable for both gaming laptops and professional setups. It features a detachable RGB fan that provides active cooling to reduce heat buildup. Therefore, it helps maintain stable performance during heavy workloads and extended use. The stand offers adjustable height and a 360° swivel design for flexible positioning. In addition, it improves ergonomic comfort by allowing users to find the best viewing angle. Its strong structure ensures stable support for large laptops. Moreover, the open design enhances airflow for better passive cooling efficiency. The RGB lighting adds a stylish gaming aesthetic to any setup. As a result, it combines performance, comfort, and visual appeal in one cooling solution. Specifications: Detachable RGB cooling fan Adjustable height ergonomic design 360° swivel rotation base Supports laptops up to 17.3 inches Enhanced airflow cooling structure
