Features: 4-in-1 car instrument, integrating oil pressure gauge, water temperature gauge, fuel gauge and voltmeter, With LCD digital display, clear and easy to view It can work under ultra-wide voltage, 40V can also work normally. When the voltage is too high or too low, it will flash and alarm. It has the function of anti-shake of oil level, and it can keep normal display even if the car is bumped or the oil float is opened. With the quick setting function of the fuel sensor, it is convenient and quick to select the existing vehicle models. With self-learning function, it can match the oil float resistance value of any model. 9-36V working voltage, suitable for most models on the market, such as cars, trucks, RVs, SUVs, etc. Specifications: Color: Black Material: Plastics Working Voltage: 9-36V Working Temperature: -40 - 50 Working Humidity: 45%-75%RH Voltage Test Range: 9-39V, Accuracy: 0.1% Water Temperature Measurement Range: -10-120, Accuracy: 0.1% Oil Test Range: 0-1.0MP, Accuracy: 0.1% Oil Resistance Range: 5-1000, Accuracy: 1% Item Size: 96 * 63 * 31mm/ 3.8 * 2.5 * 1.2in Package Size: 123 * 93 * 52mm/ 4.8 * 3.7 * 2.0in Package Weight: 284g/ 10.0oz Packing List: 1 * Car Instrument 2 * Screw