niceEshop(TM) 12V/24V Digital LCD Cigarette Lighter Auto Car Voltmeter / Gauge Voltage Volt Meter -Black Operating voltage: DC 12V/24V (Universal). Measuring range: DC 8-30V. Condition: brand new. Plug: Cigarette Lighter plug. Protection: Built-in fuse. Measurement sampling: 3 times/s. LED Display Color: Red. Displays the voltage of batteries in the car. With high brightness of LED, there is no difficulty in seeing the display. Installment: Clean the Cigar socket, Insert the jack of the product into a Cigar socket.