The voltmeter checks the voltage and display clearly in blue LED. It monitors the storage-battery's voltage in real time， showing whether the battery is used under normal working voltage. Thus it helps to extend the lifespan of the battery and the engine.Features:To check the voltage and display clearly in blue LED.Over-load and short circuit protection， reverse polarity protection.Fits for 12-24V motorcycle， auto， boat.Specifications:Color: BlackVoltmeter Measureing Range: 6V-30VVoltmeter Display: Blue LED Digital DisplayMaterial: ABSItem Size: Approx. 3.7 * 3.3cm / 1.5 * 1.3inItem Weight: Approx. 14g / 0.5ozPackage Size: Approx. 16 * 11 * 3.7cm / 6.3 * 4.3 * 1.5inPackage Weight: Approx. 17g / 0.6ozPackage List:1 * Digital Voltmeter