Liftmaster 050ACTWF MC Garage Door Receiver Logic Board Yellow Learn ButtonLiftmaster 050ACTWF MC Garage Door Receiver Logic Board Yellow Learn Button This part sells new for $115 $150. This part interchanges with the "050ACTWF" (without the MC on the end). The difference is in how you program the limit and force settings, with their new "Step Saver Setup", but that's it. Directions for that setup can be found here: https: support. chamberlaingroup. com s article Travel Force Setup MC Garage Door Openers PART#: 050ACTWFMC