1. The controller shell adopts aluminum alloy material, groove design, protection internal circuit, good heat dissipation, avoid thermal overload. 2. This project is a brushless motor controller, which can provide stable speed and sensitive control braking 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, scooters, etc. Name: Brushless electric bicycle controller Rated operating voltage: 36V~48V Rated : 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 supply voltage to adapt to universal use. Colour: Silver Material: aluminum alloy 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.