Features: 1. Designed to fit into a cigarette lighter socket, this product is easily inserted into the car's cigarette lighter for convenient use 2. 12-24V input voltage, compatible with cars, trucks, RVs, boats, buses, and other vehicles 3. The thermometer measures temperatures from -10C to 80C, allowing real-time monitoring of the vehicle's internal temperature 4. The voltmeter measures voltage from 8V to 36V, enabling continuous monitoring of the vehicles battery voltage for improved safety and timely response to potential issues 5. Features a high-efficiency IC design for stable charging performance, generating minimal heat during prolonged use, enhancing durability and ensuring safe operation Specifications: Name: Car LED 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: 12-24V 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