Type of Connection: 2.4GHz Logitech Unifying Protocol Mute, Volume Down, and Volume Up are special keys. Power/Connect: On/Off Change Specifics of the battery: Two AA A battery Duration (non-rechargeable): 18 months Key life: Five million keystrokes or more All keys have typing noise levels below 55 dBA. Range of wireless: 10 m (33 ft)