One-key desktop (long press this key for 1 second to mute the computer) Support Type-C charging Built-in 500mAh rechargeable lithium battery : (800-1200-1600) long press this button for 1 second to turn off the logo light System Requirements: Windows 98//2000/XP/Vista/Win 7/Win8/10/Vista OS or newer Type:Bluetooth mouse Number of keys: 7 keys Battery type: built-in 500mAh lithium battery Resolution: 800; 1200; 1600 adjustable Button click life: 5 mute switch Rated voltage/current: DC 3.7V/15mA Colour:black :ABS Package Contents: 1 x Mouse 1 x USB Receiver 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.