The Microsoft Wireless Mobile Mouse 4000 glides smoothly over practically all surfaces as its equipped with BlueTrack technology. 2.4 GHz wireless transmission on the Wireless Mobile Mouse 4000 provides a reliable connection with the rest of your I.T. equipment over a range of up to 9 metres. There are virtually no interferences! The nano receiver can be left plugged into your computer when youre on the go - its that small, or you can stow it away in the mouse. You can use the Wireless Mobile Mouse 4000 for up to 10 months a single battery. The power status indicator will show you when you need to recharge. The tilt wheel gives you the comfort and versatility you need to work effectively and the four programmable buttons on the Wireless Mobile Mouse 4000 provide instant access to the programmes, files and media you use most often.