7 Colors Backlit Keyboard -- This wirele keyboard has 7 stylish backlight colors and 3 low-mid-high brightne levels, not only can experience different visual enjoyments, but also make it easy to use in dark places. One keyboard for 4 Devices -- This multi-device Bluetooth keyboard allow connect up to 4 devices simultaneously, saving money and space. Specially designed for Windows/Mac OS/iOS/Android four operating systems, meeting your different needs. NOT fully compatible with mini mac computer host and latest system version Mac OS Monterey 12.0.1 or Windows 11, it is suitable for Mac OS 11.6 or below, iPad OS/iOS 13.0+, Windows XP/Vista/8/10, Android 4.3+ Rechargeable Bluetooth Keyboard -- Built-in rechargeable battery, with auto sleep mode function, this keyboard can work for up to 667 hours without backlit. Just 5 hours of charging, no need to replace battery, which is convenient and power-saving. Use included charging cable for charging, charge the keyboard fully before using it at first Ultra Slim Ergonomic Keyboard -- Ultra Slim design (the thinnest part is just 0.3 inch) and claic keyboard color greatly enhance texture and easy to carry. Unique scior switch keys and ergonomic stand help reduce typing noise, keep comfortable feeling. Full Size Universal Keyboard -- A full size keyboard with convenient numeric keypad and multi-function keys to improve work efficiency. This seenda keyboard enjoys 24-month free