Microsoft 2.4GHz Wireless BlueTrack Technology Laser Explorer Mouse with 30-Foot Range and Easy Battery Recharging Base (5AA-00001). Easy Charging - The battery status indicator tells you when a quick recharge is needed The compact, stable recharging base is easy to use Reliable Wireless on the Go - Microsoft 24 GHz wireless and the snap-in mini-transceiver deliver a reliable connection with up to a 30-foot range Sophisticated Design and Comfort - The glowing blue light effects and comfortable curved surfaces set your mouse apart Go Anywhere - Microsoft Blue Track Technology combines the power of optical with the precision of laser for remarkable tracking on more surfaces