Keep moving with a transceiver that stays in your mobile PC when you go & a mouse that works on more surfaces with Microsoft Blue Track technology! ** Blue Track Technology** Take advantage of Blue Track Technology, which combines the power of optical with the precision of laser for remarkable tracking on virtually any surface. ** Plug-&-Go Nano Transceiver** Leave the Nano Transceiver plugged in when you're on the go, or stow it in the mouse. **8-Month Battery Life** Use your mouse for up to eight months without having to change batteries. Battery status indicator tells you when battery power is low. ** On/ Off Switch** Conserve battery power by turning off your mouse when not in use. ** Comfortable in Either Hand** Use your mouse with your left or right h&. Ambidextrous design makes it comfortable either way.