Digital Voltmeter Ammeter DC 9-24V Blue Red LED Amp Dual Digital Display Volt Meter Gauge Car Current Monitor Tester with Connect Wires Descirption: brand new and high quality Features: 1.Easy to installation. Can Mount on the rear view of the mirror. 2.Super Waterproof. High performance design. Fashion appearance. Exquisite content. Rich color. High and low temperature resistance. Acid and alkali resistance. Intelligent low voltage alarm. 3.Wiring: Black line connect for negative; Red line connect for positive. 4.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 the function key for 5 seconds to exit the Voltage setting. 5.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 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! Package includes: 1 Piece Battery Voltmeter Display