Characteristics: Car Battery LED Display Cigarette Lighter Electric Voltage Meter. Car battery voltage display. Powered by a car cigarette lighter charger (12 24V DC). Installation: Insert the product s connector into a cigar socket. This digital indicator shows the voltage of the batteries in the car. With high brightness LED (light emitting diode) there is no diffusion when viewing the screen. Installation: Clean the cigar plug. Insert the product s connector into a cigar socket. Description: Display type: Digital Operating temperature: -10 to +80 degrees Celsius Accuracy class: high Item Type: Battery Testers Voltage: DC12-24V When the engine is running (do not drive), the LED display: Between 13.5 and 14.5 (12V car) Between 26.0 and 28.0 (24V car) With the engine off and nothing running, the LED display: Greater than 12.0 (12V car) or 24.0 (24V car) (for reference only). Measurement range: DC 8V-30V % 1.2 Specifications: Color: black Plastic material Size: 70x40x30mm Packing content: 1 x Electric Voltage Meter Thank you for your support Welcome to buy from us if you want buy more than we listed, please contact us.Have a nice day