The voltmeter is used to monitor the storage battery voltage. Timely grasp the state of your battery between full charged and discharged. Specifications: Product name: 12V LED Panel Car Motorcycle Digital Voltage Socket Meter Gauge Voltmeter. Material: Metal shell, plastic. Color: Black/Silver/Gold(optional). Weight: approx.31g / 1.1oz. Voltage: 12V DC. Measuring range: 5-15V. Suitable for: Car, Boat, Motorcycle, etc. Features: 3-digit display with LED digital tube, clearly showing the voltage. Used to monitor the storage battery voltage, with reverse connection protection. Timely grasp the state of your battery between full charged and discharged. High quality design with mini size, very easy to install. The indicator in the middle will twinkle to alarm when the voltage is more than 15V. Voltage measurement purposes can also be used for other products. Package Inlcuded: 1 X LED Panel Voltmeter. 2 X Connecting Cables