Feature:Universal:motorcycle/boat/ATV/UTV/camper/caravan/travel trailer, etc. Twist lock system. Display: 3 digits, LED digital tube, optional light display (red, white, blue, green, orange). Mini size, easy to install, perfect for checking voltage. Installation instructions: First open a hole with a diameter of about 3cm, put the product in, and then tighten it with a screw ring Product use: car battery voltage detection, all cars with working voltage 12V-24V can be installed and used, battery status between full charge and discharge The meter has an easy-to-read LED segment and connects to your 12V system. Wiring instructions: The back of the charging stand is marked with + and - , which can be connected to the positive and negative poles of the power supply. Product features: real-time monitoring of car battery voltage safety, with reverse connection protection, the line will not be burned. Keep abreast of the battery voltage status in time to protect your car, and it can also be used for voltage measurement of other products.Specification:Waterproof; ABS flame retardant material Diameter: 36mm/1.42 Interface type: + pole and - pole Environmentally friendly materials: plastic products Color: red, blue, green, (optional) Application: Suitable for all cars, motorcycles and other general purpose vehicles.Packing list:1*Voltmeter (3 colors optional) 2*Blue terminalNotes:Due to manual measurement, please allow an error of 1-3mm Since the monitors are not calibrated to be the same, the colors of the items shown in the photos may be slightly different on your computer monitor. The actual product shall prevail