Universal for: Motorcycle / boat / ATV / UTV / Camper / caravan / travel trailer, etc. Twist-Lock y system. Display: 3-bits, tubo digital LED It works for 12V-24V. Mini size and easy to install, they work very well for tension control. The state of the battery between full charge and discharge The meter has easy to read LED segments and connect to your 12 volt system. It is used to control the voltage of the storage battery, with the function of reverse connection protection; it will not be burned line. Timely capture the state of tension of the battery, for measuring voltage purposes can also be used for other products. Specifications: Waterproof Display: Red LED Measure the tension: 6-30V Size: 1.4 inchx 1.4inch x 0.5 inch Interface type: anode and cathode Ecological Meter: Plastic Application: Universal for all cars, motorcycles and other universal models. Package Contents: 2 x LED DC voltmeter 4 x blue Isolated terminals Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.