Specification: Item Type: Electric Bike Conversion KitMaterial: Aluminum Alloy + ABS Plastic Color: As Pictures ShownWeight: Approx. 682g / 24.1ozProduct Size: Approx. Controller Box 125x65x40mm / 4.9x2.6x1.6inController Rated Voltage: DC 36V/48VController Rated Current: 11AController Maximum Current: 22±1AController Speed Setting: 1-4.2VController Brake Input: Low LevelController Low Voltage Protection: DC 30/40±0.5VApplicable Brushless Motor Power: 500WConnector Type: Full Waterproof Connector1 To 2 Line Description: one end is connected to the controller, the other end is connected to the display and thumb throttle Controller Line Definition:1. Red, Black Single Wire: power wire2. Black Single Large wire (9pin): motor wire3. Black Single Wire (9pin): 1 to 2 wires4. Black Single Wire (3pin): power assist sensor wireLED880 Display Function Description: switch button, battery power indicator, gear 3 LED indicator, 6km/h thrust assist. Package List: 1 x Controller 1 x LED880 Display 1 x Display Manual 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.