Features: 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. Smart DC brushless controller can work smoothly and quietly. The wires and interfaces are durable, and ensure low malfunction of long time use equipped with connector instructions. The interfaces have instruction labels on them for your easy installation. Suitable for electric bicycles, scooter, etc. Specification: Material: Aluminium alloy Working Voltage: 48V Rated Power: 500W Current: 28A Low Voltage Protection: 42V Suitable for: electric bicycle, scooter, etc Size: Approx. 147 x 84 x 44mm / 5.8 x 3.3 x 1.7inch Weight: Approx. 578g Package List: 1 x Brushless Controller