Latest Mid-Drive Motor Conversion Kits, built-in controller Packing list: 1. BBS01 Mid-Drive Motor: 1 pc 2. C961 or C965 LCD Display + Operation Button: 1 pc (if no special requirement, we will send display according to our stock) 3. Brake Levers: 2 pcs 4. Thumb Throttle: 1 pc 5. Waterproof Quick Release Wires: 1 pc 6. Speed Detecting Sensor + Magnet: 1 pc 7. Chain wheel + Chain Cover: 1 pc 8. Left Crank + Right Crank: each 1 pc 9. Fixing Plate: 1 pc 10. M5*10 Nuts: 5 pcs 11. M6*12 Nuts: 2 pcs 12. M33 Nuts: 2 pcs 13. ST 3.9 Nuts: 5 pcs Specification: 1. Voltage: 48V 2. Power: 350W 3. Motor Weight: 3.8kgs 4. BB Length: 68mm (Suitable for 68mm length BB Bike Modification) 5. Working Temperature of Display: - 20°C-80°C. 6. Waterproof Grade: IP65 Installation: 1. Open the package and take out drive unit accessories; And check the specification whether it is correct. 2. Fix the chain wheel on drive unit with 5pcs screw M5*10, then fix chain cover on chain wheel with 5pcs screws ST3.9. 3. Fix the drive unit axle tube on frame bottom bracket. 4. The surface with teeth of fixing plate towards inside, then fix the plate on drive unit with 2pcs M6*10. 5. Hold the drive unit near to bicycle fork, force less than 5kgs, tight 1st nut M33 onto axle tube with force : 30-40N.m. 6. Fix 2nd nut M33 onto axle tube, tightening force: 30-40N.m. 7. Fix the left crank on the bike with M8 inner hexagon screw. Tightening force: 35-40N.m. 8. Fix the right crank on the bike with M8 inner hexagon screw. Tightening force: 35-40N.m. 9. Connect all cables for battery, display, speed detecting sensor and so on. We appreciate your business. If you are satisfied with our service, please leave us a positive feedback. Please email us before leaving any negative feedback or opening any dispute. We understand the concerns and frustrations you might have, and will do our best to resolve any issues. Warranty:One year quality warrantyBafang