Specially Designed for Surface Pro 7/7+/6/5/4 Palm Rejection: The touchpad can figure out which inputs are intended by the user, effectively rejecting unwanted contact. Bluetooth 5.0 Connection：This keyboard connects via Bluetooth, allowing it to work without Surface Pro physically connected. Smart Screen ON/OFF: The screen will go off automatically when you close the lid. It will light up when you open the lid. Ultra-long Standby: The built-in 750mAh rechargeable lithium battery ensures standby time up to 180 days. *USED ONCE *