Features: Material:Made of Eco-friendly & flame retardant durable ABS plastic and good conductivity pins with black matte surface treatment wear and tear resistant for long lasting durability. Voltmeter:The voltmeter can detect the battery voltage status at any time to prevent hidden dangers caused by bad batteries. Best Accessory:Used to monitor the storage-battery voltage with reverse connection protection it wont burn out even if wires are reversely connected.Timely grasp the state of your battery between full charged and discharged.Voltage measurement purposes can also be used for other products. Safety:High Grade Flame Retardant Materials Waterproof Totally Environment Friendly;Universal fits most DC 12-24V Motorbike Car / Boat / ATV / UTV / Camper / Travel / Caravans travel trailer etc. Help monitor the storage-battery voltage. After-sales Service:If you have any problem please contact us immediately we will help you solve it as soon as possible. Specification: Material:ABS Measurable Voltage: 6-30V Size:3.2*1.6*2.8CM Weight:0.136kg includes: 1 setVoltage Monitor "