Feature:1. [Comfortable Grip]Comfortable grip, suitable for office, games, etc. Ergonomic design to prevent wrist pain2. [Get Rid Fatigue]If you use the wireless mouse for a long time, you will get rid of fatigue. Care more about your health. Avoid carpal tunnel syndrome3. [High Resolution]Optical resolution, 1000dpi / 1600dpi / 2400dpi, suitable for notebook and desktop computers.4. [Precise Control]Vertical healthy mouse 2.4GHz wireless connection. Optical technology is used to control the accuracy5. [Adaptive System]System Requirements, for Windows, for Vista OS X or Latest VersionSpecification:Item Type: Wireless Optical MouseMaterial: ABSWireless Distance: Approx. 10m / 11ydColor: BlackWorking: PhotoelectricPower Supply: 2 x AAA Battery (There is No Battery Inside the Mouse)Number of Keys: 6 Keys (4 Buttons, 1 Roller, 1 dpi)Optical Resolution: 1000dpi / 1600dpi / 2400dpiKey Life: 8 Million TimesSystem Requirements: For Windows, for Vista OS X or Latest Version.Package List:1 x Mouse1 x USB ReceiverNote:1. The product needs 2 x AAA batteries to use, and the shipment does not include batteries.2. Shipped without battery