DROK 200167 Waterproof 180W DC-DC Synchronous Buck Converter Voltage Regulator 20-72V 24V/36V/48V/60V to 12V 15A Volt Step-down Power Supply Transformer The buck module is used to convert DC 20-72v to DC 12V, has high conversion efficient to 90 percent ), Stable performance and low heat With transient absorption high Voltage, over-current, over-heat and output short circuit protection, more safe to use Adopted the potting process technique, compact design and specially Made to be waterproof, anti-shock, moisture proof and dust-proof Easy to connect wires, input: red(+) black(-), output: Yellow(+) black(-); please connect wires correctly, or it will be damaged Wide application: car audio, radio, interphone, motors, audio, Navigator, monitor, LED car display, air Conditioner, etc