Features: The device can be used to test the battery voltage, avoiding overuse of power to affect the starting of your vehicle. Can be used to detect the temperature in your car, ensuring that you are in a comfortable environment. Dual clear LED display, blue color for voltage display, red color for temperature display, easy to read the number. USB fast charging port, can charge your mobile phone, cigarette lighter type, plug and play, convenient and practical to use. Universal fit for 12V cars, SUVs and 24V trucks and buses. 3 in 1 function: car voltmeter, car thermometer, USB mobile phone charger Specifications: Voltage: 12 / 24V Output voltage / current: DC: 5V / 3.5A 9V / 2.5A 12V / 2A Measuring range: Temperature: -10~80Diameter: 4.6cmTotal Length: 7.5cmMaterial: PlasticColor: BlackPackage Weight: 46g / 1.6ozSize: 7.5 * 4.6 * 4.6cm / 3 * 1.8 * 1.8inPackage List:1 * Digital Voltage Temperature MonitorNote: