Features: brand new and high quality It not only protects the battery and prolongs the battery life, but also increases the operating distance. Overheat for protection, the controller will cut off the power when the temperature is above and restart if the temperature is normal. 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. Package Includes: 1x Motor Controller Specifications: Standard Voltage: 36v48v350w/48 to 64v800w/36v48v450w/36v48v500w/36v48v600w/36v48v800w/48 to 64v450w/48 to 64v500w/48 to 64v600w/48 to 64v650w Material:Alloy 350W Size:Approx.10.5x6.5x3.5cm/4.13x2.55x1.37inches 450W Size:Approx.12x8x4cm/4.72x3.14x1.57inches 500W Size:Approx.15x8x4cm/5.9x3.14x1.57inches 800W Size:Approx.18x8x4cm/7.08x3.14x1.57inches Color:White 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.