Liftmaster 41AC050-1M - Receiver Logic Board Assembly for 3245 & 3255 (315 MHz). Compatible with Liftmaster 3245, 3245M, 3255, 3255M, 3270, PD210D, PD212D and HD200D models. For use with various 1/2HP LiftMaster® and Chamberlain® AC Chain Drive Garage Door Openers; manufactured after 2005.
eBay