Icom UA-1 Audio Amplifier for Icom IC-M500 Marine VHF Radio Brand: Icom Model: UA-1 Audio Amplifier MPN: UA-1 Power Rating: 13.8 VDC 7A Manufactured: Japan Description:  In like new condition and working.  Specs:  Rated output power: 25W at 10% distortion with a 4, 8, or 16 ohm load Max. input level: 200mV Output Impedance: 4, 8, 16 ohm Power requirement: 13.8V DC 7A Please ask any questions before buying. I am happy to answer to the best of my knowledge.  (100042)