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This is a replacement 315MHz Security+ Receiver Logic Board. For use with various 1/2HP LiftMaster and Chamberlain AC Chain Drive Garage Door Openers; manufactured after 2005. The unit will feature a purple learn button. Check the manual or replacement parts diagram for specific part information before ordering to ensure compatibility. Genuine LiftMaster replacement part. Also known as: 41AC050-1M, 41AB050-1, 41A5483-1C-315, 41AC050-1, 41A5689