1The controller shell is made of aluminium alloy with groove design, which can protect the inner circuit due to good heat dissipation feature to avoid thermal overloading 2This item is a brushless motor controller, it can provide steady speed and sensitive control of braking and direction changes 3The wires and interfaces are durable, and ensure low malfunction of long time use 4The interfaces have instruction labels on them for your easy installation 5Suitable for electric bicycles, scooter, etcFeatures: The controller shell is made of aluminium alloy with groove design, which can protect the inner circuit due to good heat dissipation feature to avoid thermal overloading. 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 time use. The interfaces have instruction labels on them for your easy installation. Suitable for electric bicycles, scooter, etc. Specification: Material: Aluminium alloy Rated Working Voltage: 24V Rated Power: 250W Current: 13A Low Voltage Protection: 20V Suitable Motor Phrase Angle: 60 / 120 degree Suitable for: electric bicycle, scooter, etc Size: Approx. 8.8 x 5.2 x 3cm / 3.46 x 2.05 x 1.18inch Weight: Approx. 200g Package List: 1 x Brushless Controller Note:There are 2 green wires on the controller, which are used for phase matching. After getting the hands, the phase must be used before phase matching. The 2 green wires are connected, and the motor is turned normally for 6-8 seconds before disconnecting.This controller is separate and cannot be equipped with LED meter. There are special controllers equipped with LED meter.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.