Controller Housing: Made of high quality metal with groove design, it can protect the internal circuit due to good heat dissipation, thus avoiding thermal overload. Packing List: Including 48V 250W rear drive motor, 15A controller, S900 LCD instrument, 130X dial, 8C booster, a pair of power off brake levers, motor extension cable, spokes and spoke nuts and installation tools and manual. Brushless Wheel Hub Motor: Aluminum alloy rim is selected and treated with fine craftsmanship, which effectively enhances the edge of the rim. Looks light and high end, with strong carrying capacity and far more comfort than other types of motors. 48V 250W Rear Drive Motor Kit: Suitable for bicycle lithium battery modification, DIY electric bicycle, electric vehicle, electric scooter, folding bike, etc. Easy to maintain, electric bicycle moped mountain bike modification conversion motor, high efficiency, greatly improves riding fun, For cyclists who like a challenge. Multiple Functions S900 Display: Can be used as a trip computer and control the entire bike system after conversion, compatible with 36V and 48V voltage. Makes it easier for you to view data on the panel, such as remaining battery, current speed, maximum Speed, clock, total and one way distance, guaranteed ride mileage. Item Type: Electric Bicycle Motor Controller Kit Color: As Pictures Shown Weight: Approx. 4700g/165.8oz Material: Stainless Steel + Aluminum Alloy + Plastic Size: Controller Box: Approx. 8x5x3cm/3.1×2.0x1.2in, Meter: Approx. 11x6cm/4.3×2.4in Motor Type: Rear Drive Hub Motor Motor Connector: Waterproof Connector (9pin) Motor Rated Voltage: 48V Motor Rated Power: 250W Motor Speed: About 25-28km/h Motor Speed: 207-270 RPM Motor Torque n. M: 29-31.2 N. M Motor Opening Size (mm): 135-142mm/5.3-5.6in Motor Matching Controller Current: 15A Motor RIM: P19D Motor Torque Arm: M14 Brake Disc for Motor: Approx. 160mm/6.3in Motor Brake Type: V Brake, Disc Brake Universal Motor Position: Rear Drive Motor Structure: Brushless Gear Hub Motor Motor Magnet Height: 22H Motor Magnet Pole Number: 20 Motor Operating Temperature: -20°-45° Controller Rated Voltage: DC 36V/48V Controller Maximum Current: 15A Controller Speed Setting: 1-4.2V Controller Brake Input: Low Level Controller Booster: 1:5 S900 Meter Function Description: 1. Display Function: Speed Display, Power Assisted Gear Display, Power Indicator, Fault Prompt, Total Mileage, Single Mileage, Headlight Display, Single Driving Time Display. Control and Setting Functions: Power Switch Control, Headlight Switch Control, 6km/h Jog Control, Wheel Diameter Setting, Maximum Speed Setting, Idle Automatic Sleep Time Setting, Backlight Brightness Setting, Voltage Level Setting, Power Assist Sensor Connect. Controller Wire Color Definition: 1. Black Single Big Head Cable: Waterproof Motor Cable (9pin) 2. Red and Black Single Big Head Line: Power Line 3. Red, Blue, Black, Green and Yellow Single Row Five Wire Port: Instrument Line 4. Black and Yellow Lines (two): Power off Brake Handle Line 5. Red and Black Lines: Throttle Dial Line 6. Brown, Black and Yellow Line: Power Sensor Line 7. Black and Red Lines (two): Light Lines. 2 x Power Off Brake Lever. 1 x Thumb Throttle. 1 x Speed Assist Sensor. 1 x Motor Extension Cable. 1 x Spoke Installation Tool. Use the product that complies with the communication protocol. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.