Features: brand new and high quality Stable performance, simple and most cost-effective multi-function operation, ease of use , is a compact for DC brush-less for DC drives. Professional manufacturing, stable characteristics and high reliability,it can provide steady speed and sensitive control of braking and direction changes. The controller for shell is made of high-quality metal, has a groove design, has a good heat dissipation function, can protect the internal circuit and avoid thermal overloa. This brushless motor controller is sturdy and durable, easy to install and use, It suitable for electric bicycles, scooter, etc. This item is a brushless motor controller, it can provide steady speed and sensitive control of braking and direction changes. The wires and interfaces are durable, and ensure low malfunction of long for time use. Specifications: Rated power: 500 (for w) Brake Level: high and low level Material:Alloy Size:Approx.18.9x10cm/7.44x3.93inches Color:White Standard Voltage: 48V/48 to 64V/36 to 48V Package Includes: 1x Motor Controller note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.