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.Features:? 10 Watt Amplifier? Expanded Telephone System Paging? Does Not Require 25 or 70V Line Transformers? Multiple Speaker Hookups? Requires only 22-24 gauge telco wire? Built-in Volume Control? Compact Size? Surface Mount ABS Enclosure with Snap-On Cover? Lifetime Limited WarrantySpecifications:? Rated Output: 10 Watts**? Operating Voltage: 12 to 24 Volts AC or DC**? Speaker (Output) Load: 2 to 16 Ohms**? Current Draw: 50 to 800 mA, Depending on Load and Volume Setting? Input Impedance: 1000 Ohms Nominal? Enclosure Size: 4.5" x 3" x 1.2" (111.8mm x 76.3mm x 29.2mm)