ADEMCO's Wireless Alpha Keypad substantially reduces installation costs, since there are no wires to run. Now, secondary keypads can be used on any VISTA system installation where wiring is either difficult or time consuming. The 5839 provides homeowners with all of the features of a traditional hardwired keypad with an easy-to-read, 32-character display & four function keys for single-button operation. The 5839 requires a 5883H Wireless Transceiver, which enables it to operate as a fully wireless bi-directional keypad. The 5839 is powered by a 9V battery (included), or an optional AC adaptor can be used for "always on" operation where users receive real-time status & alarms. The convenient portable design allows end-users to operate it from anywhere in the home. Features No wires to run, saving installation costs Wall mounted or freestanding on any flat surface in the home Large, bright 32-character display provides system status & zone information completely visible, making system operation easier than ever Powered with a 9V battery (included) or an optional AC adaptor for always on operation Compatible with all VISTA controls using a 5883H Receiver ONLY