The one we recommend is our Universal Remote Kit (this includes the new receiver and one remote control). If you cannot determine what type you have, we recommend that you install a new radio receiver/transmitter. Click on the picture and look at the section on the product page called 'Compatible with these Models' to determine compatibility with your Wayne Dalton Challenger garage door opener. If you have a remote control for your garage door opener, look at the pictures of remote controls listed on this page to find one that looks very similar to yours.