Compatibility: The Keyboard is only Compatible with Surface Pro 9/8/X, not compatible with any other device. This keyboard is a perfect match for your Surface Pro 9/8/X. Please carefully check your device model before purchase. 3 Backlight Brightness Adjustment: Accurately typing on the Microsoft Surface Pro 9/8/X keyboard even in the dark room. Ergonomic keys, white backlight and three adjustable backlight brightness levels, give you a comfortable typing experience. Multi-Touch Trackpad: Built-in precision trackpad that can quickly and easily navigate your Surface Pro 9/8/X. Full multi-touch gesture support allows you to quickly control your surface Pro 8/X. It also with convenient function keys, to adjust brightness levels and volume with one tap. Rechargeable Long Battery Life: The Surface Pro 9/8/X keyboard charges via USB-C. Built-in rechargeable lithium battery, charging 3 hours for 30 days working time (not use backlight). Extra long standby time up to 100 days per full charge. 2 Typing Angles: The Surface Pro 9/8/X keyboard can be used attached or detached, provides two typing angles to meet your different needs. The Surface Pro 9/8/X keyboard is made of high quality material, it is strong and durable. Compact size and light weight allows easily be carried and packed in your bag.