... certificate. lithium ion battery. PAS: 1:1 intelligent pedal electric bicycle conversion kitMotor:Front or rear wheel ,light weight, high speed ... , brushless,quiet and maintenance free, water proofGear hub motor, 16inch --28 inch wheel optional180W-250WCE ROHS certificate ... to any bike easy with quick release.All battery with electric protection circuit.CE ROHS UL certification. PAS: 1: ...