1Powerful: Compared with other ordinary controller, ours is more stable, more efficient, lower current consumption and longer service life. 2Lamp Control: Equipped with double headed light wires, able to pick up the front and rear lamps, the instrument can turn on or off the lamp. 3Increase Driving Range: Reduce the temperature rise of the controller and increase the continuous driving range of the electric bicycle. 4Sensitive: Motor controller provides stable speed and sensitive control braking and directional change. 5Outer Housing: Controller housing is made of high quality aluminum alloy, and the trench design is for good heat dissipation, avoiding overheating. Item Type: Bike Motor Controller Material: Aluminum Alloy Application: For Electric Bicycle Conversion,350W Motor Product Size: Approx.9.4x6.1x3.5cm/3.7x2.4x1.4in Weight: Approx.315g/11.1oz Rated Voltage: DC36V/48V Universal Rated Current: 8A Low Voltage Protection: DC30/400.5V Maximum Current: 171A Speed Setting: 1-4.2V Brake Input: Low Level MOSFETS: 6 MOSFETS 1 x Controller 1 x Manual Must be matched the instrument of for Quantum brand.