Function: High quality material and excellent workmanship for comfortable hand feeling. The mouse is mute, the wireless transmission distance is up to 20m. 11mA working current, intelligent power saving, long standby time. 250Hz return rate, no delay, no frame skipping, more smooth office experience. Compatible with Win2000 / WinNT4.0 / WinXP / Win.NET / Win7 / 8/10 / Mac OSX10.8 Specifications: Number of Buttons: 3Key + 3D Compatible Systems: Win2000 / WinNT4.0 / WinXP / Win.NET / Win7 / 8 / 10 / Mac OS X10.8 Return Rate: 250Hz Operating Frequency: 2.4G Switch: For Kailh 3 Million MUTE Switch