Specification: Pattern: Fox, Peacock, Koala ( optional ) Number of Buttons: 3 Keys + 3D Compatible System: For Win2000/WinNT4.0/WinXP/Win.NET/Win7/8/10, for Mac OS X10.8 Return Rate: 250Hz Working Frequency: 2.4G Switch: FD Mute 3 million times Resolution: 1600DPI Working Current: 11mA Package Including Package list: 1 x Mouse 1 x User Guide 1 x Receiver 1 x AA Battery About this item The lightless engine does not hurt your eyes. With comfortable hand feeling. Wireless transmission: The longest transmission distance is about 20 meters. Small and lightweight, easy to carry. This ultra-lightweight mouse is perfect for notebook users. Ergonomic design, natural relaxation of hands, thin and light body. Compatible for Win2000/WinNT4.0/WinXP/Win.NET/Win7/8/10, for Mac OS X10.8 system. The lightless engine does not hurt your eyes. With comfortable hand feeling. Wireless transmission: The longest transmission distance is about 20 meters. Small and lightweight, easy to carry. This ultra-lightweight mouse is perfect for notebook users. Ergonomic design, natural relaxation of hands, thin and light body. Compatible for Win2000/WinNT4.0/WinXP/Win.NET/Win7/8/10, for Mac OS X10.8 system.