Features: The controller shell is made of aluminium alloy, 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, silent working, sensitive control of braking and direction changes. More efficient and more energy-saving. It can automatically identify the phrase angle and rated voltage of electric bike. The wires and interfaces are durable, and ensure low malfunction of long time use. Each interface has different color for your easy installation. Suitable for electric bicycles, scooter, etc. Specification: Material: Aluminium alloy Rated Power: 450W Max. Current: 22A Phrase Angle: 60°/120° Size: Approx. 110 * 84 * 44mm / 4.33 * 3.31 * 1.73inch Cable Length: Approx. 15cm / 5.91inch Weight: Approx. 447g Options(Rated Voltage): 24V/36V; 36/48V; 48V/60V Under-Voltage Protection: 24V/36V-20V/31V; 36/48V-31V/42V; 48V/60V-42V/52V Package List: 1 * Brushless Controller