This cordless mobile mouse fits perfectly in your hand and complements your mobile lifestyle. Thanks to Microsoft BlueTrack Technology, you can use this mouse almost anywhere – even on a rough park bench or your living room carpet. And when you're done and ready to go, the tiny transceiver will hardly be a bother. Simply leave it plugged into the USB port for on-the-go use or store it in the bottom of the mouse. Work with just one battery for up to eight months with this mouse. And when the battery power is running low and needs to be replaced, the battery status indicator will reliably let you know.