It is a Power Supply Module/Adapter/Charger/PWM Controller, Input Voltage: DC 4.5~30V, Output Voltage: DC 0.8~30V, Output Constant Current Range: 0.1~5A, Application: DIY Power adapter/Charger, industrial equipments, electronic equipment, Communications Equipment, Power Tools, Car Driving Recorder, Car GPS, Car audio, LCD TV, Advertising screen, LED lights, Fan, intercom and monitor system, etc.