Used it to test 12V car parts such as pumps, lights, electronic controls etc. 12 VOLT DC REGULATED POWER SUPPLY FEATURES: * 3 Amp Continuous (5 Amp Surge) * LED Indicator Light * Fail-Safe Over-Voltage Circuit * Short Circuit Protected * Overload Protected with Auto Reset * Solid State Reliability * Filtered Output * Binding Posts Ideal for operating any 12-14 VDC equipment from 117VAC AC power outlet. For use with CB radio, car radio, Ham transceivers, tape players, mobile scanners and other DC equipment requiring 3 amp continuous (5 amp surge) at 13.8 VDC. The design of this unit incorporates an automatic overload circuit that shuts unit down. The unit will automatically reset. No troublesome fuses to replace. The No. MW123 is also protected against damage caused by accidental short circuit. SPECIFICATIONS: RIPPLE: 40 MV Max REGULATION: Better than -5% @ 3 Amps FOLDOVER CURRENT: 4.5 Amps INPUT POWER: 117VAC, 60 HZ CASE SIZE: 6" X 4-1/2" X 3-1/2" (including rubber feet) WEIGHT: 4-3/4 lbs