Features1Good Heat Dissipation: The controller shell is made of high quality metal with groove design, good heat dissipation function, can protect the internal circuit and avoid thermal overload. 2Brushless Motor Controller: The brushless motor controller can provide stable speed and sensitive braking and direction change control, make your ride smoother and safer. 3Good Performance: The electric bicycle brushless motor controller has high performance wires and interfaces, reliable performance, durable, ensuring low failure rate in long term use. 4Current and Voltage: Maximum current is 221A, rated voltage is DC 36V/48V, speed setting is 14.2V, rated current is11A, low voltage protection is DC 30/400.5V. 5Applicable Motor: The brushless motor controller is easy to install and use, equipped with wiring identification instructions, and is usually suitable for 500W brushless motors.SpecificationItem Type: ControllerMaterial: Aluminum AlloyController Box Size: Approx. 125x66x39mm/4.9x2.6x1.5inController Type: Sine Wave ControllerConnector Type: Ordinary ConnectorMaximum Current: 221ARated Voltage: DC 36V/48VSpeed Setting: 1-4.2VRated Current: 11ABrake Input: Low LevelLow Voltage Protection: DC 30/400.5VController Wire Color Definition:1. Black Long Wire: motor wire2. Red and Black Single Big Wire: power line3. Red, Blue, Black, Green and Yellow Five Wire Ports: display wire4. Red and Black Wires (Two): light wires5. Red abd Blue Wires (Two): power off brake handle wire6. Red Black White Wire: thumb throttle wire7. Brown Black Yellow Wire: PAS power pedal assist sensor wirePackage List1 x Controller1 x Manual