Microsoft Wireless Optical Desktop 2.0 Tilt Wheel Technology Wireless Freedom with Longer Battery Life  many users average more than 6 months battery life Get one-touch access to the functions and files you go to most Perform common commands from your keyboard: Help, Undo, Redo, New, Open, Close, Reply, Forward, Send, Spell, Save, and Print. Control your media activities- Play/Pause, Stop, Mute, Volume Up, Volume Down, Media Launch, Previous Track, and Next Track with the touch of a button.