Description Important note of single controller and single LCD display choice.A. LCD display looks the same in appearance with 3 key, While there is 2 connetors, 5 + 1 pin, 4 + 3pin.The one we have is 1 connector with 6pin.It doesn 39;t work if you choose single lcd or singel controller.B. The LCD is totally the same in appearance and with 6 pin connector.Within the protocol it differs from different vendors. Single LCD or controller won 39;t work if the protoicol is not match ApplicationFoldable scooter spare controller, Wheel 4 inch 5 inch 5.5 inch 6.5 inch 8 inch 8.5 inch, power 350w and belowCarbon fiber scooter controller kitControllerInstallation size regulator86 x 46 x 38mmTechnical dataP0, the lack of volatge (battery voltage below this does not work)P1, wheel diameter, (5.5)P2, motor pole pairs, (usually for 5.5 inch is 20)P3, is the choice of speed signal (speed from hall sensor or LCD meter)P4, it is km or miles. 0 is km, 1 is MilesP5. 0 is zero starting, 1 is not.P6 Cruise choice. (it is related to the scooter model). 1 is yes. 0 is no.P7. Soft start choice (is linked to the scooter model) 0 is soft start. 1 is difficultP8, ODO to zero. Clear record mileageColour: blackMaterial: plasticPackage Contents:1 * Controller1 * LCD Monitor1 * BrakeOnly the above package content, other products are not included.Note: Light 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.,