Features: This LCD Digital Display Voltmeter can help you get real-time temperature of your car engine Engineering plastic shell, high-quality materials, durable. Electronic digital display, more clear and intuitive. Accurate, shockproof, low consumption, convenient. Specifications: Name: Car LCD Digital Display Voltmeter Material: Engineering plastic shell Working voltage: DC12V ~ 24V Measuring accuracy: 0.1% Dimension: about 98* 57mm/3.86*2.24 inch Cable length: 3m/118.11 inch(approx) Ambient temperature: -40 ~ 85 Color: 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