Features: Made of high-quality PC material, it is flame-retardant, impact-resistant, simple to install, stable in performance, high-quality material, durable. Low power consumption, used to monitor battery voltage. With reverse connection protection function, the circuit will not burn out, waterproof and durable, safe and reliable to use. Small size and easy to store. It is widely used in electrical products that require power. Digital display of temperature and voltage, intuitive observation, accurate and stable parameter display. This circular panel voltmeter is convenient for reading, and monitors the battery voltage in real time, so that you can know the power status in time. It is suitable for the installation and use of all 12V voltage vehicles, such as automobiles, motorcycles, buses, ships, RVs, yachts, trailers, etc. Specification: Input voltage:12V-24V Operating temperature:-40°-- 80° Shell color:Black Aperture color:Red,Blue Material:ABS Hole size:27mm/1.06inch Size:3.7cm/1.46inch x 3.2cm/1.25inch. Package Included: 1 x Car Digital Temperature AmmeterVoltmeter NO Retail Box. Packed Safely in Bubble Bag.