These controllers and Gear Door Sequencers are designed to be used with air or brushed motor retracts made by a number of different manufacturers, including Robart, Century Jet Models, Freewing, eFlite, FMS, VQ, Roban, and many others.  If you have a set of retracts for which you need a controller or a gear door sequencer, and you aren't sure of compatibility with any of these controllers/sequencers, feel free to contact us and we'll be glad to help.  Most of them can be custom programmed to work with almost any brand or type of retracts.