Herorider 12V-24V DC LED Digital Display Auto Car Motorcycle Voltmeter Metro Waterproof Voltmeter Socket -- Features: Universal for: Motorcycle Car/Boat/ATV/Camper/Caravans/Travel Trailer etc. Twist-and-lock system. Display: 3 bits, digital LED tube, the lamp display is blue, red. Green It works for 12V-24V. The meter has easy-to-read LED segments and connect to 12V system. It is used to monitor memory-battery voltage, with reverse connection protection function, the line will not be burned. Timely capture the battery voltage status, voltage measurement purposes can also be used for other products. Specification: Voltmeter socket Input voltage: 12V-24V Voltage measurement: 6 ~ 33V Light color: red/blue/green Size: 3.5 x 2.7cm(L x D) Used to monitor storage - battery voltage, with protection function reverse connection, the line will not burn. Package Content: 1 PC X Car Motorcycle Waterproof Voltmeter