GMYLE 7 Colors Backlit Aluminum Bluetooth Keyboard Ultra Slim for iOS Android Windows - Metallic Silver 7 backlight color options with 2 brightness level and auto sleep function to maximize power usage. Supports 3 major operating system: iOS / Android / Windows. Works with all Bluetooth supported devices, even laptops and computers. Built in rechargeable battery provides 64 hours of effective usage time with 100 days on standby. Ultra slim portable body design (11.09x 5.31x0.17in); Lightest weight in its class. Package includes: GMYLE Wireless Backlit Bluetooth Keyboard, USB charging cable & user manual.