1. The controller shell is made of aluminium alloy, which can protect 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 braking and direction changes.3. The wires and interfaces are durable, and ensure low malfunction of long time use.4. The interfaces have instruction labels on them for your easy installation.5. Suitable for electric bicycles, scooter, etc.Rated Voltage: 24V,36V,48VUnder-Voltage Protection: 200.5V, 31.50.5V, 420.5VMatch Motor: 250WmotorMaterial: Aluminium alloycolour:Silversize:6.7 x 5.9 x 3.5CMPackage Contents:2 x Brushed ControllerOnly the above package content, other products are not included.Note: Light shooting 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.