Features: 1. Designed to fit into a cigarette lighter socket, simply insert into the car's cigarette lighter for convenient use 2. Input voltage: 12-24V, compatible with cars, trucks, RVs, boats, buses, and other vehicles 3. Thermometer measures temperature range from -10C to 80C, allowing real-time monitoring of temperature 4. Voltmeter measures voltage from 8V to 36V, enabling continuous monitoring of vehicle voltage for improved safety and timely response to emergencies 5. Equipped with an efficient IC charging circuit design, built with high-quality materials to prevent overheating during extended use, extending service life and ensuring safe operation Auto car voltmeter with cigarette lighter adapter featuring dual LED display for thermometer and voltmeter, 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 Light color: Red + Blue, Red + Red, Red + Green display options Input voltage: 12 to 24V Voltage measurement range: DC 8-36V Temperature measurement range: -10C to 80C Installation method: Plug-and-play, directly inserts into the cars cigarette lighter socket Package includes: 1 x LED Dual Digital Thermometer Voltmeter