Features: The controller shell is made of aluminium alloy with groove design, which can protect the inner circuit due to good heat dissipation feature 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. The cables have different colors for your easy installation. Suitable for electric bicycles, scooter, etc. Specification: Material: Aluminium alloy Rated Working Voltage: 36/48V Rated Power: 1200W Current: Max. 45A Low Voltage Protection: 31/42V Suitable Motor Phrase Angle: 60 / 120 degree Suitable for: electric bicycle, scooter, etc Size: Approx. 23 x 8.5 x 4.5cm / 9.05 x 3.35 x 1.77inch Weight: Approx. 728g Package List: 1 x Brushless Controller