Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain.Silent Click: soundless design for the right and left buttons, help you a quiet atmosphere without disturbing others.800 / 1200 / 1600 Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for and precise tracking on a wide range of surfaces.Added /previous buttons when webpage browsing; the superior choice for internet surfers, gamers and people who work at length at the computer.Compatible with most system including Windows 7 / 8 / 10, XP, Vista and Linux. Fit for Notebook, PC, Laptop, Computer, and other device.[Not fully compatible with products]Type: MouseWireless technology: 2.4GWireless distance: 10mKey number: 6Resolution: 800/1200/1600dpiOperating cycles: 1,000,000 cyclesBattery: AA*1 ( Not included )System requirement: Windows 2000/ 2003/ / XP/ Vista/ Win7/ 8/ 10/ OS/ LinuxSize: 104 x 60 x 76mmMaterial: ABScolour: blackPackage Contents:1 x Mouse1 x ReceiverOnly 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.