Feature: 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 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. Package List: 1 x Mouse1 x USB Receiver Note: 1. The product needs 2 x AAA batteries to use, and the shipment does not include batteries.2. Shipped without battery