1. The controller shell adopts aluminum material, groove design, protection internal circuit, good heat dissipation, avoid thermal overload. 2. This project is a brushless motor controller, which can stable speed and sensitive control and direction change. The sine wave controller works smoothly and mute. 3. Wires and interfaces are durable to long periods of use with low failures. 4. These interfaces are marked with instructions for easy installation. 5. Suitable for electric bicycles, , etc. Name: Brushless electric bicycle controller Rated operating : 36V~48V Rated power: 250W, 350W Features: Strong functionality, exquisite appearance, evenly distributed and thickened heat dissipation cogging on the shell, strong heat dissipation function, intelligent identification of two-pole power supply to adapt to universal use. Colour: Silver Material: aluminum Package Contents: 1 x Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.