374578 Feature: The car battery output 24V， input audio electric 12V. Can support LCD screen， subwoofer， car audio at the same time. Convert your DC 24 volts to DC 12 volts with this compact power supply converter which gives you the option of powering your 12V devices by your 24V truck battery. Flow automatically with overheating protection. Package Includes: 1 x Car Power Supply Converter