Wireless Technology - Works up to 30 feet of wireless distance. Operates on 12 different channels, each with 65,536 different IDs. Built-in Trackball with Optical Sensor - Tracks accurately and precisely with less muscle movement for maximum comfort. Ergonomic Contour Design - Minimizes forearm muscles from twisting and pains from Carpal Tunnel Syndrome Integrated Palm Rest - Keeps your wrists in the most comfortable position. Split Key Design - Encourages natural position of hands, wrists and forearms for maximum comfort. Full Size Desktop - Provides a better typingh experience. Membrane Switch - 5 Million keystroke lifecycle for a quiet and fast typing experience. Auto Sleep and Power On/Off Switch - Maximizes your battery life up to 6 months. Wireless Receiver - Small and convenient to plug into to your laptop or tablet. Membrane Key Layout: 105-Key US Layout Connection: 2.4GHz Radio Frequency Wireless Technology with 30ft working range Battery: (2) AAA, Included Trackball: Built-in Indicators: Num Lock, Caps Lock & Low Battery Windows Hotkeys: 13 (Home, Back, Forward, Refresh, Search, Favorites, Sleep, Wake Up, Power Off, Calculator, My Computer, Music & Email ) Multimedia Hotkeys: 7 (Play/Pause, Previous Track, Next Track, Volume Up, Volume Down, Mute & Eject)