Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si This controller only works with sensored brushless DC motor This controller and lcd display must connect the motor hall sensor and throttle! And the speed limit can works for pedal assist and throttle . [Excellent performance]: The motor has strong climbing ability and low motor running noise, eliminating tire noise. [Scope of application]: Can drive sine wave motors, rectangular motors, and also suitable for Hall motors, can support 36V/48V general, suitable for electric bicycles, electric . [Outstanding upgrade accessories]: motor has thicker copper bars, higher inductance accuracy, smoother starting, and more comfortable riding. [Exquisite workmanship]: Our products are professionally manufactured, with stable performance, increased shell thickness, and better heat dissipation. High reliability. The uphill torques of the controller is increased Colour:Photo Color Material:aluminum alloy Size:9 x 5 x 3cm 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.