Features: 1.[Comfortable Grip]Comfortable grip, suitable for office, games, etc. Ergonomic design to prevent wrist pain 2.[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 syndrome 3.[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 accuracy 5.[Adaptive System]System Requirements, for Windows, for Vista OS X or Latest Version specification:Item Type: Wireless Optical Mouse Material: ABS Wireless Distance: Approx. 10m / 11yd Rated Voltage , Current: 1.5V,20mA Color: Black Working: Photoelectric Power 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 / 2400dpi Key Life: 8 Million Times System Requirements: For Windows, for Vista OS X or Latest Version PackageList:1 x Mouse 1 x USB Receiver Note1. The product needs 2 x AAA batteries to use, and the shipment does not include batteries. 2. Shipped without battery