Features1Due to the good heat dissipation function, the internal circuit can be protected to avoid thermal overload. 2Easy to install and remove, without any professional requirements even though you are an amateur. 3Shell is made of highquality metal with groove design, durable enough for long time use. 4450W brushless controller, LCD display, suitable for 22.5mm / 0.9in handlebars. 5It can provide stable speed and sensitive control of braking and direction changes.SpecificationItem Type: ControllerMaterial: Aluminum AlloyController Box Size: Approx. 11.4 x 8.5 x 4.5cm / 4.5 x 3.3 x 1.8inWeight: Approx. 660g / 23.3ozPower: 450WCurrent Limit: 23AThread Color Definition:Red Power InputYellow Switch OutputBlue Signal TransmissionGreen Signal ReceptionBlack NegativeTwistHandlebarPackage List1 x Controller1 xBike ThumbThrottle1 x Manual