Keep moving with a transceiver that stays in your mobile PC when you go and a mouse that works on more surfaces with BlueTrack Technology.Features Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on virtually any surface (does not work on clear glass or mirrored surfaces) Plug-And-Go Nano Transceiver 8 month battery life ON/OFF Switch Left or right hand ambidextrous design PC and Mac compatible-For simple connection to your computer Operates on a single AA alkaline battery (included) Built-in battery indicator