Hippus Wireless Light Click HandShoe Mouse (Right Hand, Medium, Black) Fits hand sizes from 6.9 to 7.7" (175.2 to 195.5 mm) Unique contoured shape offers support for your whole hand, preventing carpal tunnel syndrome BlueRay Track sensor provides laser precision that works on almost every surface Plug-and-play; no special software drivers are needed Continue working while charging; however, the receiver must be plugged-in