ICOM IC-PS20 AC Power Supply. Provides 13.8 VDC at 20 Amps. The output cable has the rare factory-installed 3-pin socket connector to mate with the rear of the IC-551D. It is ideal for powering the IC-551D as the power supply ON-OFF operation is remotely controlled by the power ON-OFF switch on the IC-551D. $100. Mike W4UM