1. The controller shell is made of aluminium alloy, which can the inner circuit and good for heat dissipation to avoid thermal overloading. 2. This item is a brushed motor controller, it can provide steady speed and sensitive control of and direction changes. 3. The wires and interfaces are , and low malfunction of long time use. 4. Suitable for electric bicycles and scooter. Rated Voltage: 36V/48V Match Motor: 250W motor Suitable for: electric bicycles and scooter Material: aluminum alloy colour: silver 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.