The ELK-800 is a great compact public address audio amplifier. It may be connected to a telephone system paging output, a microphone, or even an ordinary single line phone set (see Basic PA system below). The audio source is amplified up to 10 watts, adjustable from an on-board volume control. Remotely installed, it saves money by requiring only 22 - 24 gauge telco or alarm type wire. It operates on 12 to 24 volts AC or DC and can also drive multiple speakers.