1Small size, light weight, easy to carry, providing users a good using experience. 2Brushless motor controller can provide stable speed and sensitive control of braking and direction changes. 3Strict quality control and quality assurance, high safety factor, can be used with peace of mind. 4Electric bicycle brushless motor controller is easy to install and use. The LCD display screen is suitable for 22.5mm/0.9in handlebars. 5Controller shell is made of highquality metal with groove design. Due to its good heat dissipation function, it can protect the internal circuit and avoid thermal overload. Item Type: Brushless ControllerMaterial: Aluminum Alloy Weight: Approx.910g/32.1oz Handlebar Cord Length: Approx. 180cm/70.9in Controller Box Size: Approx. 15x8.5x4.5cm/5.9x3.3x1.8in Power: 500W Current Limit: 28A Voltage: 36V/48V Universal Thread Color Definition: Red Power Input Yellow Switch Output Blue Signal Transmission Green Signal Reception Black Negative Handlebar 1 x Controller 1 x Pair of Handlebar 1 x Manual