Universal:motorcycle/boat/ATV/UTV//caravan/travel trailer, etc. Twist lock system. Display: dual display VA 3 digits Voltmeter, LED digital tube, optional light display (blue). It is suitable for 12V-24V. Mini size, easy to install, perfect for checking voltage. Mounted to the panel, nylon retaining nuts hold the gauge in place. Battery status between full charge and discharge The meter has easy-to-read LED segments and connects to your 12 volt system. Used to monitor battery voltage, with reverse connection protection, not be burned. The battery voltage status can be grasped in time, and it can also be used for voltage measurement of other products. Product Name: Dual Voltage Display Meter Wiring instructions: "+" to the positive pole "-" to the negative pole Input voltage: 12V-24V Operating temperature: -40°C to 80°C Product size: 37x37x32MM Product features: flame retardant, high temperature resistance, anti-, , not easy to deform Specifications: A Blue light Color: Black Material: PC Package Contents: 1 * Voltage and current meter 2 * Blue terminal 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.