The Samsung Crystal UHD U8000F 55″ 4K TV UA55U8000FUXTW uses a 55-inch LCD panel with 3840 × 2160 resolution. It delivers standard 4K output for everyday TV, streaming, and console use. Samsung uses the Crystal Processor 4K for image processing and upscaling. As a result, lower-resolution content converts closer to 4K quality on the screen. In addition, the TV supports HDR10 and HDR10+, which improve contrast between bright and dark areas. The display runs at a 60 Hz refresh rate. Also, Motion Xcelerator reduces blur during fast scenes such as sports and action content. Samsung equips the TV with Tizen OS. Therefore, users access streaming apps, SmartThings integration, and built-in smart functions through a simple interface. Connectivity includes HDMI ports, USB ports, Wi-Fi, Bluetooth, Ethernet LAN, and optical audio output. In addition, the TV supports ALLM for basic gaming response performance. This model focuses on 4K resolution, standard HDR support, and essential smart TV features without advanced gaming or local dimming systems. Specifications: 55-inch LCD panel with 3840 × 2160 4K UHD resolution Crystal Processor 4K with upscaling support HDR10 and HDR10+ compatibility 60 Hz refresh rate with Motion Xcelerator Tizen OS with HDMI, USB, Wi-Fi, Bluetooth, Ethernet connectivity
The Alienware AW3225QF 32″ 240Hz QD-OLED 4K Gaming Monitor is built for gamers who want top performance. It features a 32-inch curved QD-OLED screen that delivers vibrant colors, deep blacks, and wide viewing angles. With a 4K resolution of 3840 x 2160 and a blazing fast 240Hz refresh rate, gameplay feels smooth and detailed. Its ultra-low 0.03ms response time ensures every movement is crisp and fast with minimal blur. The screen has a gentle curve that wraps around your field of view, making gaming more immersive and natural. This design helps reduce eye strain and keeps you comfortable during long gaming sessions. NVIDIA G-SYNC and AdaptiveSync support keep gameplay fluid and responsive without screen tearing or stutter. It’s perfect for competitive gaming and fast-paced action where timing matters most. The monitor supports HDR with a peak brightness of up to 1000 nits, giving you deep contrast and lifelike images. Colors appear bright and accurate, enhancing your experience in both games and videos. It includes HDMI 2.1 and DisplayPort 1.4 for modern consoles and PCs, plus USB Type-C and USB 3.2 ports. These options make it easy to connect your devices, charge accessories, and stay organized. The stand adjusts for height, tilt, and swivel so you can find the perfect viewing angle. It’s also VESA mount compatible, giving you even more flexibility in your setup. The Alienware AW3225QF 32″ 240Hz QD-OLED 4K Gaming Monitor delivers elite visuals and features for serious gamers. Specifications: Display : 32″ QD-OLED Resolution : 4K UHD 3840 x 2160 Refresh Rate : 240Hz Response Time : 0.03ms
The Philips 242V8 24″ 75Hz Monitor is a great choice for home and office use. It delivers clear visuals and smooth performance. With its Full HD resolution, you can enjoy sharp and detailed images. This 24-inch monitor features a 75Hz refresh rate for fluid motion. It reduces screen tearing and stuttering, making it ideal for everyday tasks and casual gaming. The fast response time ensures smooth transitions between frames. The Philips 242V8 24″ 75Hz Monitor uses SmartContrast technology for deep blacks and bright whites. It enhances image quality, making videos and images look better. The IPS panel provides wide viewing angles with consistent colors. With Flicker-Free technology, this 75Hz monitor reduces eye strain. It also includes LowBlue Mode to minimize harmful blue light. This makes it comfortable for long hours of use. Connectivity is simple with HDMI and VGA ports. You can easily connect it to your PC, laptop, or gaming console. The setup is quick and hassle-free. The Philips 242V8 24″ 75Hz Monitor has a slim and modern design. It fits well in any workspace, whether at home or in the office. The adjustable tilt stand provides a comfortable viewing experience. This Full HD monitor is energy-efficient, helping you save on power consumption. It meets eco-friendly standards while delivering high performance. In conclusion, the Philips 242V8 24″ 75Hz Monitor is a reliable and affordable display. It offers smooth visuals, eye comfort, and a sleek design, making it a perfect choice for work and entertainment. Specifications: Display : 24″ IPS Resolution : 1920×1080 Refresh Rate : 75Hz Response Rate : 4ms Speaker : 2W x2
Genuine-spec touchpad flex cable for Apple’s 12-inch MacBook (Model A1534, Early 2015 / Early 2016 / Mid 2017)—essential for restoring full Force Touch trackpad functionality, haptic feedback, and multi-touch gesture support. Compatible With: MacBook 12″ (Early 2015) – 1.1GHz Core M MacBook 12″ (Early 2016) – 1.1GHz/1.3GHz Core M MacBook 12″ (Mid 2017) – 1.2GHz/1.3GHz Core m3/i5/i7 All share Model Number A1534 and Model Identifier MacBook8,1 / MacBook9,1 / MacBook10,1 respectively. MacBook 12″ (Early 2015) – 1.1GHz Core M MacBook 12″ (Early 2016) – 1.1GHz/1.3GHz Core M MacBook 12″ (Mid 2017) – 1.2GHz/1.3GHz Core m3/i5/i7 All share Model Number A1534 and Model Identifier MacBook8,1 / MacBook9,1 / MacBook10,1 respectively. Part Type: Touchpad flex cable only—does not include the trackpad housing, Taptic Engine, or mounting brackets. This is the ribbon cable that connects the Force Touch trackpad to the logic board. Function: Critical for Force Touch functionality—transmits pressure-sensitive input, multi-touch gestures (e.g., pinch, swipe, Force Click), and haptic feedback signals to the Taptic Engine. OEM-Quality Construction: Precisely matches Apple’s original in length, connector pitch, shielding, and routing—ensures reliable signal integrity and compatibility with macOS. Common Use Cases: Replacing a torn, creased, or liquid-damaged flex cable Restoring unresponsive or erratic trackpad behavior Completing a trackpad replacement when the original cable is unusable Replacing a torn, creased, or liquid-damaged flex cable Restoring unresponsive or erratic trackpad behavior Completing a trackpad replacement when the original cable is unusable Installation Note: Requires full bottom case removal and delicate disconnection of the ZIF connector. The cable routes tightly under the battery—extreme care is required. Recommended for experienced or certified technicians only.
The ViewSonic VX24G10 24″ FHD 240Hz Gaming Monitor delivers ultra-smooth visuals ideal for gaming and daily use. It displays Full HD resolution with bright colors and crisp detail. The screen uses an IPS panel for wide viewing angles and accurate color. This makes movies, work, and games look clear and vivid. Moreover, the VX24G10 offers a blazing 240 Hz refresh rate. It reduces motion blur and makes fast movements appear fluid. This is especially helpful in competitive games or fast action scenes. The 1 ms response time ensures quick pixel transitions for sharp results. It helps avoid ghosting and lag during gameplay. In addition, the monitor includes modern connectivity options: multiple HDMI ports and DisplayPort. These ports let you connect PCs, laptops, and consoles easily. This flexibility supports many devices without trouble. The monitor also supports adaptive sync (FreeSync / G-Sync), which reduces screen tearing and ensures smooth frame rates. Furthermore, the ViewSonic VX24G10 features eye-friendly technology. Its flicker-free panel and blue-light filter help reduce eye strain during long sessions. The slim bezel design gives a modern look and saves desk space. The stand allows slight tilt adjustment for comfortable viewing angles. Also, the monitor supports HDR10, enhancing contrast and improving dynamic range for richer images. This adds depth to games, movies, and creative work. The combination of IPS quality, fast refresh, and HDR makes the VX24G10 a versatile choice for both gaming and productivity. Overall, the ViewSonic VX24G10 24″ FHD 240Hz Gaming Monitor offers smooth motion, sharp visuals, strong compatibility, and eye care. It is perfect for gamers, creators, and anyone who values performance and comfort. It enhances every task — from gaming to work to watching media. Specifications: Display : 24″ IPS Resolution : 1920×1080 Refresh Rate : 240Hz Response Time : 1ms
Introducing the LG MyView Smart Monitor – your all-in-one display solution for work, entertainment, and everything in between. With its innovative features and user-friendly interface, this monitor redefines convenience and efficiency. First and foremost, versatility is the name of the game. Whether you’re working on spreadsheets, streaming your favorite shows, or gaming with friends, the MyView Smart Monitor adapts effortlessly to your needs. Transitioning between tasks is seamless thanks to its intuitive interface and quick response times. Say goodbye to cluttered desktops and hello to a streamlined workflow that maximizes productivity. Moreover, connectivity options abound. From wireless casting to multiple input ports, the MyView Smart Monitor ensures compatibility with a wide range of devices. Whether you’re using a laptop, tablet, or smartphone, connecting is hassle-free. In addition, ergonomic design features such as adjustable stands and eye-care technology prioritize your comfort and well-being during extended use. Say goodbye to eye strain and discomfort – the MyView Smart Monitor has your back. Furthermore, its sleek and modern design adds a touch of sophistication to any space, whether it’s your home office or entertainment center. Elevate your surroundings with a display that not only performs but also complements your aesthetic. In conclusion, the LG MyView Smart Monitor is more than just a display – it’s a versatile companion that enhances every aspect of your digital life. Experience the convenience, efficiency, and style it brings to the table, and unlock a world of possibilities today. Specifications: Display : 27″ IPS Resolution : 1920 x 1080 Refresh Rate : 60Hz Response Rate : 5ms GTG Speaker : 5W x2
The Stylus Pen is an active capacitive stylus pen designed for smooth and precise writing on all capacitive touchscreens. Featuring a superfine copper nib, palm rejection, and rechargeable battery, it’s perfect for note-taking, drawing, and everyday touchscreen use with iPads, iPhones, tablets, and smartphones. The Superfine Nib Active Capacitive Stylus Pen (Silver) is built for users who want accurate and smooth writing on touchscreens without needing Bluetooth or an app. Its superfine elastic copper tip provides delicate strokes while helping protect your screen from scratches. With palm rejection support, rechargeable battery, and one-click operation, it’s ideal for students, professionals, and creators using iPads, iPhones, and other capacitive touchscreen devices. Superfine Copper Nib for smooth writing and accurate strokes Palm Rejection Technology for comfortable writing experience No Bluetooth / No App Required – one-click operation Rechargeable Battery with up to 10 hours working time Magnetic Cap Design prevents loss and keeps the pen protected Compatible with iOS & All Capacitive Touchscreens Lightweight & Portable ideal for travel, school, and office use Compatible with all capacitive touchscreen devices, including iPad Pro, iPad Mini, iPad Air, and iPhones (11 series and earlier generations), plus most Android tablets and touchscreen phones.
A1932 A2179 A1965 Battery for MacBook Air 13″ Retina (2018 2019, Early 2020) EMC 3184 3302 MRE82 MRE92 MVFH2 MWTJ2 MVH22 MVFM2 MVFK2 MREE2 MREC2 MREA2 MREF2 MUQT2 MUQU2 MacBookAir8,1 8,2 9,1 📄【Specification】Voltage: 11.4V. Capacity: 49.9Wh 4379mAh. Battery Type: Li-Polymer. Condition: Brand new, from high quality materials, top circuit boards and smart chip. 🔋【Replace Part Number】A1965 A1932(EMC 3184) A2179(EMC 3302) 3ICP4/63/119 MacBookAir8,1 MacBookAir8,2 MacBookAir9,1. 💻【Compatible Models】Only fit for MacBook Air 13″ (Model A1932 & Model A2179) Release 2018 2019 2020, fit for MRE82LL/A, MVFH2LL/A, MVFM2LL/A, MVFK2LL/A, MVFJ2LL/A, MVFN2LL/A, MVFL2LL/A, MREE2LL/A, MREC2LL/A, MREA2LL/A, MREF2LL/A, MRE92LL/A, MWTJ2LL/A, MVH22LL/A, MVH52LL/A, MVH42LL/A, MWTL2LL/A, MWTK2LL/A. Please kindly check the model number at the bottom of your laptop (A****). NOT FIT FOR MODEL A2337. 💻【ANTIEE Promise】Each products has undergone rigorous testing to ensure the correct voltage, circuit protection, stable current, low self-discharge and CE / FCC / RoHS Certified for safety. About 500 recharge cycles over the life.
The Lenovo 65W Round-Tip AC Adapter (AU) provides reliable and efficient power for compatible Lenovo laptops. Designed with a round-tip connector and Australian plug, it’s perfect as a replacement or travel charger. ⚡ 65W Power Output: Delivers stable and efficient charging for Lenovo laptops and notebooks. 🔌 Round-Tip Connector: Designed specifically for Lenovo models using the classic round charging port. 🇦🇺 AU Power Plug: Built for Australian power outlets — ideal for home, office, and travel use in AU regions. 👜 Compact & Portable: Lightweight design makes it easy to carry in a bag or backpack. 🔒 Safe Charging: Features over-voltage, over-current, and short-circuit protection. 🛠️ OEM-Compatible: Works with a wide range of ThinkPad, ThinkBook, and IdeaPad models using round-tip charging.
LG 27 inch 240Hz Gaming Monitor 27GK750F-B is built for competitive gaming and fast-paced action. It features a 27-inch Full HD TN display with a very high refresh rate for smooth motion. Additionally, it supports NVIDIA G-Sync Compatible and AMD FreeSync. Therefore, it delivers low-latency performance and reduced screen tearing for esports gaming. The LG 27 inch 240Hz Gaming Monitor 27GK750F-B runs at 1920 × 1080 resolution with a 240Hz refresh rate and 2ms response time. Moreover, it includes a 400 nits brightness level and supports 16.7 million colors for clear visuals. It offers HDMI and DisplayPort inputs for flexible connectivity. In addition, the stand supports height, tilt, swivel, and pivot adjustments for ergonomic use. Furthermore, it includes gaming features like Black Stabilizer, Crosshair, and Dynamic Action Sync. As a result, it improves visibility and reaction speed in fast games. It also supports Motion Blur Reduction for sharper movement clarity during high FPS gameplay. Specifications: 27-inch Full HD (1920 × 1080) TN display 240Hz refresh rate for ultra-smooth gameplay 2ms response time with Motion Blur Reduction NVIDIA G-Sync Compatible and AMD FreeSync support Adjustable stand with height, tilt, swivel, and pivot
Philips 278B1 27-inch 4K UHD IPS monitor delivers sharp detail and professional-grade clarity for productivity, design, and everyday office work. It focuses on UltraClear 4K resolution, ergonomic adjustability, and eye comfort features. Additionally, it features a 27-inch IPS panel with 4K UHD resolution (3840 × 2160). This provides high pixel density and precise detail, so it improves multitasking and content accuracy. Moreover, it supports a 60Hz refresh rate with a 4ms response time. As a result, it delivers stable and smooth performance for office tasks and media use. The monitor offers a 350 cd/m² brightness level and strong contrast performance. Therefore, it improves visibility and keeps images clear in different lighting conditions. In addition, it includes wide 178° viewing angles using IPS technology. This ensures consistent color and clarity from almost any position. Furthermore, it comes with a fully adjustable ergonomic stand. It supports height, tilt, swivel, and pivot adjustments for better comfort during long working hours. It also includes eye comfort features such as Flicker-Free and LowBlue Mode. So it helps reduce eye strain during extended screen use. Philips 278B1 27-inch 4K UHD IPS monitor provides sharp visuals, flexible ergonomics, and productivity-focused performance for professional environments. Specifications: 27-inch IPS panel with 3840 × 2160 4K UHD resolution 60Hz refresh rate with 4ms response time 350 cd/m² brightness with strong contrast performance Fully adjustable stand with height, tilt, swivel, pivot Flicker-Free and LowBlue Mode for eye comfort
Arabic MacBook Pro Keyboard Cover 2023 2022 14 inch A2779 A2442 - Pro 16 inch A2780 A2485 M1-2022 MacBook Air Keyboard Cover 13.6 inch M2 A2681 Silicone Skin Ultra Thin, Arabic Language Arabic MacBook Pro Keyboard Cover 2023 2022 14 inch A2779 A2442 – Pro 16 inch A2780 A2485 M1-2022 MacBook Air Keyboard Cover 13.6 inch M2 A2681 Silicone Skin Ultra Thin, Arabic Language About this item Arabic Keyboard Layout Fits Perfectly 2023 MacBook Pro 14 inch keyboard cover A2779 A2442 M1 Pro Max Chip and Pro 16 inch A2780 A2485 2022 MacBook Air M2 keyboard skin A2681. Kuzy Mac keyboard cover have been engineered to fit snugly onto the low profile keyboard We employed the best industry standards in this Mac Book keyboard cover. Kuzy laptop keyboard covers made out of High Elastic Silicon. Every key is individually molded for a long lasting professional look. Advanced Spill and Dust Protection Soft Flexible and Washable Silicone keyboard skin makes typing quiet and soft to the touch. Flexible, environmentally smart keyboard protector design lets you roll up the MacBook keyboard cover for storage and travel. Quickly apply and remove Keyboard Cover Compatible with 14 inch MacBook Pro model A2779 A2442 also 16 inch MacBook Pro A2780 A2485 and 13.6 inch MacBook Air A2681. Maintain the longevity of your Apple device by eliminating key wear and tear with Kuzy computer keyboard covers
Laptop Charger for HP 90W 19.5V 4.62A (Blue Tip) Pavilion 17 15-E 17-E 14-E 15-AK Series Touchsmart Sleekbook M6-K M7-J 17-J M6 M7 709986-004 709986-002 753560-001 710413-001 PPP012D-S AC Adapter
MacBook Air 13″ Retina A1932(2018-2019-2020) Display Assembly (Silver) MacBook Air 13″ Retina Display 2019 A1932 (EMC 3184 MacBookAir8,2) 1.6 GHz MacBook Air 13″ Retina Display 2020 A2179 (EMC 3302 MacBookAir9,1) 1.1 GHz Core i3 A2179 (EMC 3302 MacBookAir9,1) 1.1 GHz Core i5 A2179 (EMC 3302 MacBookAir9,1) 1.2 GHz Core i7 MacBook Air 13” Retina Display Late 2018 A1932 (EMC 3184 MacBookAir8,1) 1.6 GHz
The Apple MacBook Pro 16-inch (2019) is powered by an Intel Core i7 processor, paired with 16GB RAM and a fast 512GB SSD for powerful and reliable performance. Designed for professionals and creatives, it features a premium aluminum build, immersive 16-inch Retina display, and dedicated Radeon Pro graphics for demanding workloads.
The HP P24H G5 24” 75Hz FHD Monitor is a modern display designed for everyday work, entertainment, and productivity. It combines clear visuals, smooth motion, and simple usability in a sleek design. First, this monitor features a 23.8-inch Full HD (1920 × 1080) IPS panel for bright colors and wide viewing angles. As a result, text and images stay sharp for work, videos, and browsing. In addition, the HP P24H G5 24” 75Hz FHD Monitor supports a 75 Hz refresh rate, giving smoother motion for videos and casual gaming. Therefore, motion looks more fluid than on basic 60 Hz screens. This display uses wide 178°/178° viewing angles and anti-glare treatment to help reduce reflections and maintain clarity from many positions. This makes it easier to share content with others. The panel also delivers a typical brightness of 250 nits and a contrast ratio of 1000:1, so whites and blacks stay balanced for clear content. Thus, your work and entertainment stay easy to see. The HP P24H G5 includes built-in dual 2 W speakers for basic audio without extra accessories. This helps when you watch videos or join online meetings. Connectivity options include HDMI 1.4, DisplayPort 1.2, and VGA, so you can connect laptops and desktops easily. This makes setup quick with many devices. The stand supports height adjustment and tilt to help you find a comfortable viewing position for long sessions. Also, it has a 3-sided micro-edge bezel for a modern look and cleaner multi-monitor setups. This monitor is also flicker-free with low blue light mode, helping reduce eye strain during extended use. This makes it suitable for office work and daily use. In conclusion, the HP P24H G5 24” 75Hz FHD Monitor offers clear display, smooth visuals, and flexible connectivity for work and play. Overall, it is a strong choice for home, office, and small business setups. Specifications: Display : 23.8″ IPS Resolution : FHD (1920 x 1080) Refresh Rate : 75 Hz Response Rate : 5ms GtG
The Samsung 85-Inch QLED 4K Smart TV QA85Q7FAAUXTW delivers a premium large-screen viewing experience with advanced QLED display technology. It produces bright, sharp, and colorful images, so movies, sports, and games look immersive and detailed on the massive 85-inch screen. QLED technology uses Quantum Dot enhancement to improve brightness and color accuracy. As a result, visuals appear more vivid and balanced across both dark and bright scenes. This helps maintain consistent picture quality in different lighting conditions and content types. Samsung Vision AI enhances picture and sound in real time. It analyzes each scene and automatically adjusts brightness, sharpness, and color for optimal results. Therefore, the TV consistently delivers improved visuals without manual tuning. In addition, AI upscaling improves lower-resolution content closer to 4K quality for better clarity and detail. HDR support expands contrast and color depth, making visuals more dynamic and lifelike. Fast motion handling also improves clarity, which enhances sports and action content by reducing blur and improving smoothness. The Smart TV platform provides easy access to streaming apps, gaming features, and smart home controls. It runs smoothly and allows quick switching between applications. In addition, the slim design with thin bezels gives the Samsung 85 QLED 4K Smart TV QA85Q7FAAUXTW a modern and premium appearance suitable for large living spaces. Overall, this Samsung QLED TV combines strong brightness performance, AI optimization, and smart connectivity for an immersive home entertainment experience. Specifications: QLED technology delivers bright and vivid picture quality 85-inch 4K display provides immersive large-screen viewing Vision AI optimizes picture and sound automatically in real time HDR improves contrast, brightness, and color depth Smart TV platform supports apps, streaming, and smart features
The Samsung 85″ The Frame QLED 4K Smart TV QA85LS03FAUXTW uses an 85-inch 4K UHD LCD panel with 3840 × 2160 resolution. It is designed for both standard TV viewing and wall-mounted display use. The display uses a QLED layer with Quantum Dot technology to improve color reproduction. As a result, it produces wider color output and more consistent brightness across different content types. In addition, it supports 4K upscaling for lower-resolution video. The TV supports HDR formats for compatible content. This increases contrast between bright and dark areas and improves detail visibility. Also, motion processing reduces blur during fast-moving scenes such as sports and action content. Samsung runs this model on Tizen OS. Therefore, users access streaming apps, SmartThings integration, and smart features through a unified interface. It also supports Wi-Fi and Bluetooth for wireless device connections. Connectivity includes HDMI ports, USB ports, Ethernet LAN, and optical audio output. It supports external devices such as gaming consoles and sound systems. This model uses The Frame design concept, which allows the TV to function as both a display and a digital art screen when not in use. Specifications: 85-inch 4K UHD LCD panel (3840 × 2160 resolution) Quantum Dot (QLED layer) color enhancement 4K upscaling for lower-resolution content HDR support for compatible content Tizen OS with HDMI, USB, Wi-Fi, Bluetooth, Ethernet connectivity
Original 13.3-inch Retina LCD display assembly for MacBook Pro A1502 (pulled from a working unit). OEM part, ready to replace cracked or malfunctioning screens with perfect visual quality. This is a genuine Retina display assembly removed from a fully functional MacBook Pro model A1502. It’s ideal as a replacement for a damaged or broken screen, offering original Apple quality without needing aftermarket components. Key Features & Functionality Factory Retina IPS panel with high color accuracy and brightness Integrated LCD, backlight, front glass, display cable and hinges Tested for proper display, backlight, no dead/stuck pixels (unless noted) Designed to match original tolerances, alignment, and thickness Compatible with MacBook Pro A1502 models (various years) Detailed Specifications Important Notes & Considerations Ensure model is A1502 — other MacBook Pro models have different connectors and frames. Even though tested, minor cosmetic marks or micro-scratches may exist. Handle with extreme care — glass is fragile, flex cables delicate. Professional reinstallation recommended for best alignment and function.
The MSI Optix G27C7 Gaming Monitor delivers immersive visuals with a 27″ curved display and Full HD resolution. The 1500R curve enhances comfort and viewing experience. Moreover, it features a 165Hz refresh rate for smooth and responsive gameplay. A 1ms response time helps reduce motion blur in fast scenes. The VA panel provides high contrast and deep blacks. It also offers wide 178° viewing angles for consistent image quality. Adaptive Sync with FreeSync Premium reduces screen tearing and stuttering. This ensures smoother gameplay performance. Additional features include Night Vision for better detail in dark areas. Anti-flicker and low blue light help reduce eye strain. The MSI Optix G27C7 Gaming Monitor is a solid choice for users who want curved immersion and smooth performance. Specifications: 27″ Full HD VA curved panel with 1500R curvature 165Hz refresh rate for smooth gaming performance 1ms response time for reduced motion blur AMD FreeSync Premium for tear-free gameplay Wide viewing angles with high contrast ratio
