Dear customer, please pay special attention when choosing a controller. Please carefully check whether there is an interface at the front wiring of your electric bicycle. If there is no interface, please choose a normal line controller. If there is an interface connection, please choose an integrated line. If you are unable to make a judgment yourself, please contact the backend staff for confirmation before placing an order. In addition, after placing the order, please provide photos of the damaged controller to the store staff, especially the interface part. We need to confirm that it is correct before we can ship it to you. Thank you.