Features:This LCD Digital Display Voltmeter can help you get real-time temperature of your car engineEngineering plastic shell, high-quality materials, durable.Electronic digital display, more clear and intuitive.Accurate, shockproof, low consumption, convenient.Specifications:Name: Car LCD Digital Display VoltmeterMaterial: Engineering plastic shellWorking voltage: DC12V ~ 24VMeasuring accuracy: 0.1%Dimension: about 98* 57mm\/3.86*2.24 inchCable length: 3m\/118.11 inch(approx)Ambient temperature: -40 ~ 85Color: Black(as pictures show)How to wire:Red: positive; black: negative(connect reverse, the instrument does not work)Note:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item.2. Please allow 1-3mm error due to manual measurement.Package contents:1* Digital Display Voltmeter Kit