How to Use: Controller Description: The wire color definition interface on the controller can be connected to the socket of the accessory to realize the function. For the specific operation, please refer to the wiring diagram and manual. Specification: Item Type: Bicycle Lithium Battery Modification 15A Controller LED-S810 Display Kit Material: Aluminum Alloy + ABS Plastic Color: As Pictures Shown Weight: Approx. 509g / 18.0oz Product Size: Controller Box: Approx. 82x52x30mm / 3.2x2.0x1.2in Controller Rated Voltage: DC 36V/48V Controller Maximum Current: 15A Controller Speed Setting: 1-4.2V Controller Brake Input: Low Level Booster: 1:5 Applicable Motor Power: 250W, 350W Connector Type: Full Waterproof Connector Controller Line Definition: 1. Red, black single wire: power wire 2. Black single large wire (9pin): motor wire 3. Black single wire (9pin): 1 to 2 wire 4. Black single wire (3pin): power assist sensor wire 5. Black single wire (2pin): light wire Package List: 1 x Controller 1 x Display 1 x Thumb Throttle 1 x Power Assist Sensor 1 x Controller Wiring Manual 1 x 1 to 2 Connecting Line Note: 1. Modification kits must be fully waterproof kits.2. Please allow 1‑3mm error due to manual measurement. Thanks for your understanding.