2-in-1 Voltage Temperature Monitor 12-24V Voltmeter Thermometer Cigarette Lighter Auto Volt Detector Thermometer Car Accessories. Features: Convenient Design, Wide Voltage Compatibility, Accurate Temperature Monitoring, Reliable Voltage Measurement, Efficient Charging Circuit. Specification: Origin: Mainland China, Weight: 39G, Size: diameter 4cm/1.56in, length: 7.5cm/2.93in, Material: ABS environmentally friendly material shell, smart IC chip, Input voltage: 12-24V, Voltage measurement range: DC8-36V, Temperature measurement range: -10--80℃, Installation method: When using, directly insert it into the cigarette lighter socket on the car and it can be used normally.