Take the Microsoft Wireless Mobile Mouse 4000 anywhere. With revolutionary Microsoft BlueTrack Technology you can work more places than ever before including on granite countertops carpets-even on a wood table or a rough unfinished park bench. Plus you can choose your colour to suit your mood.Features:BlueTrack Technology - Combines the power of optical with the precision of laser for remarkable tracking on virtually any surface Plug-And-Go Nano Transceiver - Leave the Nano Transceiver plugged in when you re on the go or stow it in the mouse 2.4 GHz Reliable Wireless - Microsoft 2.4 GHz wireless delivers a reliable connection with up to a 30-foot range with virtually no interference 10-month Battery Life- Use your mouse without power interruption for up to 10 months on a single battery. Battery status indicator tells you when battery power is low Windows Flip in Windows 7 - Easily switch between open windows with the click of a button 4-way scrolling - Scroll four ways for greater efficiency and comfort with Tilt Wheel Technology 4 Customisable Buttons - Get quick access to the media programs and files you use most often with customisable buttons.