Product Advantages: 1. [Multi-function on-board electrical appliances: (measure battery voltage + display car temperature + UBS mobile phone charging)] 2. [Pressure measurement: avoid excessive use of electricity in the car, which affects starting the vehicle] 3. [Temperature: Detect the temperature in the car and keep it comfortable] 4. [USB: mobile phone charging is convenient and fast] 5. [Material: fireproof ABS material] Feature: 1. Multifunction: Car LCD digital display. 2. With car charger: real-time monitoring of temperature and voltage in the car 3. Easy to install: no professional skills are required. 4. Pressure measurement: avoid excessive use in the car and affect the starting of the vehicle 5. Temperature: detect the temperature in the car to keep it comfortable 6. USB: mobile phone charging is convenient and fast Description Voltage description: Plug this baby into the car cigarette lighter jack, the car battery voltage will be displayed on the screen. It can be used in 12V cars, SUVs, and 24V trucks and buses. The meaning of different voltages can refer to the figure above. However, due to the differences in batteries, generators, and stabilizers of different models, the meaning of different voltages is different. This baby only tries to faithfully reflect the car battery voltage. Thermometer description: It can measure the temperature of -10~80 in the car. In order to accurately measure the temperature, the temperature sensor is placed outside the product, and the sensor can be bent a bit during use to avoid hot parts of the car (such as parts exposed to the sun) that may affect the measurement results. Package Included: 1 * 3 in 1 cigarette lighter USB car + voltmeter + thermometer Note 1. Due to different manual measurement methods, please allow slight size differences. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee that the style is the same as the picture.