The meter has easy to read LED segments and connect to your 12 volt system. Used to monitor the storage-battery voltage, with reverse connection protection function, line not be burnt. Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products. It works for 3V-35V. Mini size and easy to install,work great for checking Voltage. Universal for: Motorbike Car / Boat / ATV / UTV / / Caravans / Travel Trailer etc. Twist-and-Lock system.Display: 3-bits, LED digital tube With Touch-ON OFF Switch,easy to use and save energy. Support battery voltage value and capacity percentage of battery display Touch-about 5s to turn on or turn off the power. The state of your battery between full and discharged Waterproof; Flame retardant material Measure voltage: DC 3V - 35V Size: 36 * 22mm Interface Type: Anode and cathode Color: Black Material: ABS LED display color: Green Application: Universal for all Cars, motorcycles and other universal models. Package Contents: 1 * Voltmeter with Touch-ON OFF Switch 2 * Wiring plug Only the above package content, other products are not included. Note: Light reflection 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.