Feature:1. COMPATIBLE MODEL: Adapt to the old version for BBS01B BBS02B mid drive controller, need to confirm your controller version in advance.2. PREMIUM MATERIAL: Electric cycle mid drive controller is made of premium aluminum material, high hardness, sturdy and erosion resistance, long service life.3. EASY TO INSTALL: Mid drive controller replacement wiring interface can be easily recognized, easy for you to better and quickly replace the installation, let you enjoy the fun of riding.4. MULTIPLE SAFETY GUARD: Mid drive controller has multiple safety guard, high power guard, power failure guard, brake guard, over voltage guard device.5. STANDARD MANUFACTURING: Electric cycle mid drive controller is manufactured and produced with strict standard specifications, after many rigorous tests to ensure stable performance.Specification:Item Type: Mid Drive ControllerMaterial: Aluminum.Package List:1 x Mid Drive Controller Note:Only suitable for BBS01B BBS02B older versions, you should confirm your controller version before placing an order. (typically motors produced in 2015 or earlier)