With compact Portable Design.New Waterproof Car Motorcycle LED DC Digital Display Voltmeter.The meter has easy to read and connect to your 12 /24 Volt System. Used to monitor the storage-battery voltage.With reverse connection protection function (if the wire is reversely connected, the will not be burned to damage.).Mainly used to monitor battery voltage and know the running status of the Voltmeter and also can be applied to measuring the voltage of other products.Color: BlackLED Color: Blue, Red, GreenInput voltage: DC12V-24V (The alternating current cannot be used)The range of measurement: 5V ~ 30VMaterial: ABS, LED Digital displaySize: about 42mm(L) x 60mm(W)Interface Type: Connection of Cathode and AnodeNote: (IMPORTANT) No Instructions Included. Installation Is Highly RecommendedPackage Contents:4 x Waterproof Car Motorcycle LED DC Digital Display Voltmeter8 x Screws8 x Insulated TerminalsNote: Random color, don't accept the specified color.Only 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.