It is a Auto Buck Boost Converter/Voltage Regulator/Adapter/Driver Module/Car Power Supply Module, Input Voltage: DC 12V/24V(8V~40V), Output Voltage: DC 12V, Output Current: 2A(3A max), Power: 24W, Application: Suitable for Car alarm, radio, interphone, motors, audio, navigator, monitor, LED car display, air conditioner, fans, solar energy, photovoltaic energy, DVD, LED lights, pumps, industrial equipment appliances, etc.