2.4GHz RF Frequency : 8 different frequencies with 65536 IDs per channel : 100 feet effective working range : Standby Mode after 8 minutes : Uses 4-AA Batteries for up to 3 months use : Optical Type, 800 DPI Trackball Resolutions : Streamlined full-featured RF keyboard built-in 27mm Track Ball with Optical Technology : Hot Key - WWW, Pre-Page, Next-Page, Volume-Up, Volume-Down, Mute, E-Mail, Suspend, WWW-Stop, WWW-Refresh, WWW-Search, My-Favorite : Keyboard - 15.1 x 7 x 1.9 inch (385 mm x 178 mm x 50 mm) : Receiver - 3 x 0.8 x 0.39 inch (78mm x 21.5mm x ...