Enhanced Control 38 mm circular Touchpad with horizontal and vertical scrolling Acceleration settings goes from None to 10 times the scrolling speed TouchDisk can be disabled with FN + Left Click on the keyboard 17 onetouch access controls with instant backlit feedback 57 mm touch sensitive volume slider with instant backlit feedback Connectivity Bluetooth® Wireless Technology, version 2.0 Power and Battery Builtin rechargeable 950 mA lithium ion battery Fastcharge time: About 5 min for approx. one day usage Fullcharge time: About 2 hours for up to 2 months usage System Requirements Windows® XP SP2 or Windows Vista™ all editions Available USB port CDROM Drive