3 Colors 12-24V Car LED Display Voltmeter Voltage with ON /OFF Switch Low Voltage Alarm Waterproof Motorcycle Boat Car Voltmeter Features: Voltage With ON /OFF Switch,Easy to install, convenient to use. When Voltage is lower than 11.5V, Voltmeter will Alarm. Used to monitor the storage-battery voltage, with reverse connection protection function, line will not be burnt. Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products. Very convenient and easy to use. Fitment: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc. Specifications: Material: Plastic and Metal Voltage detection range: DC 8-30V Size: 4.03.6cm LED Voltmeter Display Color: Red/Green/Blue Package include: 1pcs x Car LED Voltmeter