MFJ-4115 Switching power supply, 13.8V 15A, small Output is 13.8 VDC, 17 Amps surge and 15 Amps continuous Ultra-Compact Dimensions: 3.75 W x 2.25 H x 7.75 D Great for Traveling or Tight Spaces Output Voltage: 13.8 VDC with 15 amps Continuous and 17 amp surge Has over-voltage and over current protection