Features: LED display cigarette lighter electric voltage meter for auto car battery. Car battery voltage display. Powered by car cigarette lighter charger (DC 12~24 V). Insert the jack of the product into a cigar socket. This digital gauge displays the voltage of batteries in the car. With the high brightness of the LED (light-emitting diode), there is no difficulty in seeing the display. Clean the cigar socket before use. Display Type: Digital. Operating Temperature: -10 to +80 Celsius degree. Accuracy Class: high. Item Type: Battery Testers. Voltage: DC 12-24V. When the engine is running (do not drive), the LED display: Between 13.5 to 14.5 (12V CAR). Between 26.0 to 28.0 (24V CAR). With the engine off and nothing turned on, the LED display: Greater than 12.0 (12V CAR) or 24.0 (24V CAR) (for reference only). Measuring range: DC 8V-30V ±1.2%. Specifications: Color: Black. Material: Plastic. Size: 70*40*30mm. Packing content: 1 x Electric Voltage Meter. Note: Please pull out the device when you leave your car. Do not use the device for more than 2 minutes in 24V cars, or it may cause damage.