0.56" Two Wire DC Red/Blue/Green LED Digital Voltmeter,Measuring Range DC2.5-30V (Do not need Power Supply, Measure 2.5-30V directly ),it has Waterproof, Oil Pollution Prevention, Moistureproof, reverse connection protection, small size, high efficiency, long term stable and reliable quality, easy installation and use . Application: Motorcycle, Car, E-bike, ATV, Scooter, home,factory,garden,And other platforms.