1. The product has reverse connection protection, and the reverse connection will not burn out;2. Lead-acid battery Lithium battery is common and can be adjusted by the buttons on the back;3. It can display battery symbol + percentage or battery symbol + voltmeter, and the two display modes can be switched at will4. The product has only two wires, the wiring is simple, it is equipped with a wiring socket, and the wire length is 300mm;5. The selection of all battery specifications and functions is set through the buttons on the back, without the need for an electric soldering iron.Light colour: BlueMaterial: ABScolour: As shownPackage Contents:1 x Battery indicatorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.