Features: 1. Designed to fit into a cigarette lighter socket, easily inserted into the car's cigarette lighter port for convenient use 2. 12-24V input voltage, compatible with cars, trucks, RVs, boats, buses, and other vehicles 3. Built-in thermometer measures temperature range from -10°C to 80°C, allowing real-time monitoring of车内 temperature 4. Voltage meter measures DC 8-36V, enabling continuous monitoring of vehicle voltage for improved driving safety 5. Equipped with a high-efficiency IC charging circuit design, ensures stable performance, minimal heat generation during extended use, and prolonged service life Auto car voltmeter with cigarette lighter adapter featuring dual LED display for thermometer and voltmeter readings 12V Specifications: Name: Car Digital Voltmeter + Thermometer Model: CS-302 Size: Diameter 4 cm, Length 7.5 cm Material: ABS environmental protection material, intelligent IC chip surface Display Light Color: Red + Blue, Red + Red, Red + Green options Input Voltage: 12-24V Voltage Measurement Range: DC 8-36V Temperature Measurement Range: -10°C to 80°C Installation Method: Plug-and-play, directly inserts into cigarette lighter socket Package Includes: 1 x LED Dual Digital Thermometer Voltmeter