Features: The device can be used to test battery voltage, preventing overuse of power to affect the starting of your vehicle. Can be used to detect the temperature in your car, making sure you are in a comfortable environment. Clear dual 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, SUV and 24V trucks and buses. 3 in 1 function: car voltmeter, car thermometer, USB mobile phone charger Features: Voltage: 12 / 24V Voltage / current output: DC: 5V / 3.5A 9V / 2.5A 12V / 2A Temperature measurement range: -10~80 Diameter: 4.6 cm Total length: 7.5 cm Material: plastic Color black Package weight: 46g / 1.6oz Size: 7.5 * 4.6 * 4.6 cm / 3 * 1.8 * 1.8 inch Package List: 1 * Monitor digital voltage temperature Note: To accurately measure the temperature, the temperature sensor is external to the product. When using it, you can bend the sensor slightly to avoid hot parts of the car that may affect the measurement results (such as parts exposed to the sun).