ITEM NAME:0.28 inch DC 0-100V 3 Wire Mini Gauge Voltage Meter Voltmeter LED Display Product Description Description: Features: 1. This voltmeter has the smallest volume, the measuring range DC 0-100V, 2 wire and 3 wire products are universal. 2. It can work directly in 5V, 9V, 12V, 24V circuits without voltage regulation. 3. Equipped with three wiring, easy access to the car/electromobile/motorcycle internal line, with reverse connection protection function, wiring will not burn. 3. It can be used to monitor battery voltage and master battery voltage status in time. 4. It can also be used for voltage measurement of other products. 5. The product has good stability and high measuring accuracy. 6. Appearance adopts standard size, easy to install. 7. Power supply adopts polar protection circuit. Specifications: 2 wire operating voltage: 4.0-40V (with reverse connection protection function) 2 wire detection voltage: 0.0-40V 3 wire operating voltage: 4.0-40V (with reverse connection protection function) 3 wire detection voltage: 0.0-100V Working Current: