How to Use: Wiring instructions: 1. Wiring instructions of the controller connector: Red: Meter power cable. Blue: Power control cable of the controller. Black: Meter ground cable. Green: Data receiving line of the meter. Yellow: Data transmission line of meter. 2. Expand the headlight function: Brown line (headlight positive), white line (headlight negative). Operation instructions: The display meter socket connected to the controller meter interface can achieve the function. Specification: Item Type: Electric Bicycle Display Weight: Approx.270g / 9.5oz Material: Plastic Product Size: Meter Approx.11 x 6cm / 4.3 x 2.4in, Line Length Approx.165cm / 65.0in Applicable Handlebar Mounting Diameter: Approx.22.2mm / 0.9in Voltage: 36V 48V Socket: 5 Pin SM Waterproof Socket Application: Suitable For JN Controller And Suitable For Pasion Electric Bicycle Motor Kit Function Description: 1. Display Functions: Speed Display, Power Gear Display, Power Indicator, Fault Hint, Total Mileage, Single Mileage, Headlight Display, Single Driving Time Display. 2. Control And Setting Functions: Power Switch Control, Headlight Switch Control, 6km/H Inching Control, Wheel Diameter Setting, Maximum Speed Setting, Idle Automatic Sleep Time Setting, Backlight Brightness Setting, Voltage Level Setting, PAS Connection. 3. Communication Protocol: UART Package List: 1 x S900 Meter 1 x Manual