This item is a set of 2pcs Power Supply Module. Input voltage: DC 8~22V (please make sure the input voltage higher than the output voltage 3V). Output voltage: DC 1~15V adjustable. Output current: 3A (recommend 2A in a long-term working). Output power: 45W. Application: Power adapter, industrial equipments, electronic equipment, Communications Equipment, Power Tools, Car Driving Recorder, Car GPS, Car audio, LCD TV, Advertising screen, Monitoring System, LED lights, Fan, intercom and monitor system, etc.