It is a Digital Tester/2in1 Voltmeter Ammeter, Power supply: DC 3.8~30V, Measuring Voltage range: DC 0~100V, Measuring Current range: 0~20A, Test accuracy: ± 0.2% + 2 words, It has small size, high efficiency, long term stable and reliable quality,easy installation and use . Applications:Suitable for Auto,Electric bikes,motorcycles, LED lights, industrial equipment,electronic equipment measurement or other products voltage current measurement.