Features: 1. Designed to fit into a cigarette lighter socket, easily inserted into the car cigarette lighter for convenient use 2. 12-24V input voltage, compatible with automobiles, trucks, RVs, boats, buses, and other vehicles 3. Built-in thermometer measures temperature range from -10C to 80C, allowing real-time monitoring of temperature 4. Voltage meter measures DC 8-36V, enabling continuous monitoring of vehicle voltage for improved driving safety 5. Equipped with an efficient IC circuit design for stable charging performance, minimal heat generation during prolonged use, extended service life, and enhanced safety 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 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 insert into cigarette lighter socket for immediate operation Package includes: 1 x LED Dual Digital Thermometer Voltmeter