MFJ Enterprises Original MFJ-4230MV 30Amp Switching Compact Power Supply 13.8VDC MFJ-4230MV gives you 25 Amps continuously or 30 Amps surge at 13.8 VDC. switching power supply that also has a meter and adjustable voltage control. A simple front-panel push-button switch lets you choose either Ampmeter or Voltmeter -- allows you to select Amps or Volts as you wish to read them. DC output is five way binding posts on the back of the MFJ-4230MV so you can power your dedicated HF, VHF or UHF transceiver with ease. The voltage is front-panel adjustable from 4 to 16 Volts.