1The controller shell is made of aluminium alloy with groove design,which can protect the inner circuit and good for heat dissipation to avoid thermal overloading 2This item 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 4Sine wave controller works smoothly and silently 5Suitable for electric bicycles,scooter,etcFeatures: The controller shell is made of aluminium alloy with groove design,which can protect the inner circuit and good for heat dissipation to avoid thermal overloading. This item is a brushless motor controller,it can provide steady speed and sensitive control of braking and direction changes. The wires and interfaces are durable,and ensure low malfunction of long time use. Sinewavecontrollerworkssmoothlyandsilently. Suitable for electric bicycles,scooter,etc. Specification: Material: Aluminium alloy Working Voltage: 36/48V Rated Power: 1000W Current: 38A Low Voltage Protection: 31/42V Suitable for: electric bicycle,scooter,etc Size: Approx. 190 x 84 x 44mm / 7.5 x 3.3 x 1.7inch Weight: Approx. 676g Package List: 1 x Brushless Controller Note:Please note that the new type and old type of this product will be sent randomly,and make sure you will not mind before ordering.Please note that the product has no instrument display interface and cannot be used with instruments.