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DROK 2pcs Car Thermometer Inside & Voltage Monitor Parameters: Input voltage: 12V/ 24V Power mode: cigarette lighter power Functions: 1. Auto battery voltage monitor Firstly, plug the gauge into the car cigarette lighter socket and its screen will display the voltage of the auto battery Secondly, the volt/temp gauge could be used in 12V car or 24V truck/ motor coach 2. Temperature tester inside your cars Firstly, its testing range should be within 10-170 ℉ Secondly, to gain accurate temperature, the temp sensor is set outside of the temp gauge. You can bend the sensor to avoid heating parts of the car in your usage. For example, you can bend the sensor to avoid direct sunshine. Package includes: 2x Auto Volt Temp Gauge