12V 24V Voltage Meter Digital Car Motorcycle LED Voltmeter Battery Gauge Display F19A Features: Easy to installation. Can Mount on the rear view of the mirror. Super Waterproof. High performance design. Fashion appearance. Exquisite content. Rich color. High and low temperature resistance. Acid and alkali resistance. Intelligent low voltage alarm. Wiring: Black line connect for negative; Red line connect for positive. Function setting: Press and hold the function key "SET" for 5 seconds, the Voltage zone number of the flashes, the function key "SET" can adjust the Voltage zone value; press and hold function key. When the voltage is lower than the preset voltage, the battery icon on the interface will flash to remind you. Specification: Voltage: DC 9V-24V, Note: Input voltage higher than 24V may be permanently damaged! LED color: Red / White / Green /Blue/Purple/Gold Material: ABS, Metal Size: Approx.5.3x4cm/2.09x1.57in Lead Length: 49cm Package Weight: Approx. 71g Package Includes: 1 Piece Battery Voltmeter Display note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!