Features1Aluminum Alloy Shell: The controller housing is made of high quality aluminum alloy, which protects the internal circuit from thermal overload due to good heat dissipation. 2Scope of Application: Electric bike built in controller is suitable for 36V 250W 350W 500W mid motor. Electric bicycle mid motor modification and replacement accessories. 3Controller Description: The wire color definition interface on the controller can be connected to the mid motor accessory socket to realize the function. 4Voltage and Current: Rated voltage is DC 36V, maximum current is 15A, low voltage protection is DC 30V, 40V. Controller size is 80x73mm / 3.1x2.9in. 5Durable to Use: The motor controller is made of good quality materials, which is lightweight, sturdy and durable to use. Giving you a more comfortable riding experience.SpecificationItem Type:ElectricBicycleMidMotorBuilt in ControllerMaterial: Aluminum Alloy Shell + PCB Board + PlasticProduct Size: Approx. Controller 80x73mm / 3.1x2.9inColor: As Pictures ShownWeight: Approx. 283g / 10.0ozMaximum Current: 15AApplication: 48V 250W, 350W, 500W Mid MotorPackage List1 x Built in Controller