1.It is used to monitor battery voltage. It has reverse connection protection function, which prevents the circuit from burning out, it is waterproof and , safe and reliable to use. 2. Round panel voltmeter is easy to read and real-time monitoring of battery voltage allows you to know the electric quantity status in time. 3. Made of PC, are high quality materials, are durable. 4.The product length is 3.6cm, the width is 2.4cm and the height is 2.7cm. 5.It is suitable for motorcycles, automobiles, ships, off-road vehicles, motorhomes, caravans, caravans, etc. Specification: Item Name: Temperature Voltmeter Input Voltage: 12-24V Output Voltage: 5V Working Temperature: -40 degrees Celsius to 80 degrees Celsius Aperture Color: Color Display Note: Due to different production batches, there may be slight differences between the products. Color: Black Material: Plastic Package Contents: 1 x Temperature Voltmeter Only the above package content, other products are not included. Note: Light