Features: LED display voltage meter for automatic car battery Indication of car battery voltage. With high brightness of the LED there is no difficulty to see the screen Installation: insert the product jack into a socket This digital gauge displays the voltage of the batteries in the car. for W/ high brightness of the LED (LED) there is no difficulty in viewing the screen. Specifications: Input voltage: 12-24V Output voltage: 12-24V Measuring range: 9-31V Ambient temperature: 0-60 (℃) Package Includes: 1Pcs Car Voltage Tester note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!