Note: When installing the non professionals, please pay attention to the line order, can not be connected to the wrong line, otherwise it is very easy to cause the burning of Holzer and LED tube.Specification:Brand new and high qualityVoltage:24V/36V/48VColor:Black+BlueMaterial: ABSSize: Approx. 115x35mmFits for: 22mm diameter HandlebarDescription:By turning the real-time voltage value can accurately determine the amount of the remainingamount of electricity,To avoid traveling on the way without electricity and accurate judgmentof the lithium battery is damaged.Installation method:Speed to the red, black, green three lines, which the red line is the positive pole (the controller must be transferred to the line of the positive pole line can not be wrong, remember ) , the black line is to turn the negative, the green line is to turn the signal line, a separate yellow is connected to the battery positive line.Package Contents: 1 Pair x Turn HandleOnly the above package content, other products are not included.Note: Light shooting 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.