Having a compact size with LCD display, this product makes the numbers look more convenient. You can set separate time, voltage or temperature displays, or cycle through the display modes. By designing with 3-in-1 function, this product can provide you with alarm clock, voltage and temperature display inside and outside the car, which is very convenient. Made from LED, plastic and electronic component, the product is durable to use. The length of the product is 7.8 cm, the width is 3 cm, the height is 1.85 cm. The cable is 65 cm long. It is suitable for DC 12V vehicles, such as cars, SUVs, etc. The product has a built-in rechargeable super capacitor, which saves the trouble of changing the button battery. After the car is turned off, it can last for 10 days, and it can be fully charged in 1 minute when it is used again. Item Name: Voltmeter Material: Plastic,Electronic Component,LED Power Supply: DC 12V LED Color: Red/Blue Voltage Measurement Range: DC 6V-30V Temperature Measurement Range: -20 to 70 Degrees Celsius Features: Easy Installation, Compact, High Accuracy Size Details: Product Size: 7.8cm x 3cm x 1.85cm(Approx.) Cable Length: 65cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Voltmeter