7 Color Backlight and 3 Brightness Level: The adjustable backlight allows you personalize your setup, match specific working conditions and showcase your favorite colors. Make it easier to type in the dark. Detachable and Attachable Keyboard: The slim and lightweight keyboard is magnetically attached to case, you can simply leave it behind for hand-held mode. Quiet and Quick Input: The scissor-switch key and Bluetooth 3.0 of keyboard case give you a quiet, soft and quick input. And the transmission distance is up to 10 M. Suitable for a pleasant, silent environment in the office or at home. Rechargeable Keyboard: The wireless keyboard has built-in 650 mAh rechargeable battery and can work 220 hours without backlight or 3 hours with backlight on. Standby time is up to 800 hours.