2 x LED DC Voltmeter: 1 x a + 1 x b Universal for: Motorcycle / boat / ATV / UTV / Camper / caravan / travel trailer, etc. Turn and lock system. Display: 3-bits, LED digital tube 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 works for 6-30V. Mini size and easy to install, work great for checking Voltage. The state of your battery between full charged and discharged. The meter has easy to read LED segments and connect to your 5-25 volt system. 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. 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 Color: Black & Black-green LED display: Blue Voltage Measure: 6-30V Size: 1.4 inchx 1.4inch x 0.5 inch Interface type: anode and cathode Ecological Meter: Plastic/Acrylic Application: Universal for all cars, motorcycles and other universal models. Display: 3-digits 36inch Size: 37 x 29mm Mounting hole: 29mm Package includes: 2 x LED DC Voltmeter 2 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. LED Voltmeter 12-24V voltmeter LED display voltage meter