1The controller shell is made of aluminium alloy with groove design, which can protect the inner circuit and has good heat dissipation feature to avoid thermal overloading. 2This product is a brushless motor controller, it can provide steady speed and sensitive control of braking and direction changes. 3The wires and interfaces are durable, and ensure low malfunction of long time use. 4The cables have different colors for your easily installation. 5Suitable for mountain road bike. Features: 1.The controller shell is made of aluminium alloy with groove design, which can protect the inner circuit and has good heat dissipation feature to avoid thermal overloading. 2.This product is a brushless motor controller, it can provide steady speed and sensitive control of braking and direction changes. 3.The wires and interfaces are durable, and ensure low malfunction of long time use. 4.The cables have different colors for your easily installation. 5.Suitable for mountain road bike. Specification: Condition: 100% Brand New Material: Aluminum alloy Color: as pictures shown Brake: V brake/disc brake Controller: 36V/48V universal Suitable for 1000W 1500W motor Motor mounting opening: the front drive opening is 100mm, the rear drive opening is 135mm Package list: 1 x Brushless Controller