Descriptive Features 1.It is used to monitor the battery voltage. It has a reverse connection protection function, making the circuit will not burn out, it's waterproof and durable, safe and reliable to use. 2.This round panel voltmeter is easy to read, and the real time monitoring of battery voltage is convenient for you to know the status of electric quantity in time. 3.Made of pc, it is high-quality materials, it's durable. 4.The length of this product is 36cm, the width is 24cm and the height is 27cm. 5.It is suitable for motorcycles, automobiles, ships, all-terrain vehicles, campers, caravans, travel trailers, etc. Specification Item Name: Voltmeter Material: PC Input Voltage: 12-24V Output Voltage: 5V Operating Temperature: -40 Degree Celsius to 80 Degree Celsius Shell Color: Black Aperture Color: Red, Blue The package includes: 1 X round temperature and voltmeter (4 optional) 1 X Fixing Thread Ring Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.