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The LiftMaster 45ACTMC is a 315MHz Security+ 2.0 receiver logic board replacement kit designed for select LiftMaster and Chamberlain AC chain-drive and belt-drive garage door openers manufactured after 2011. It features a yellow learn button and supports compatible wireless programming. Also known as 45ACT, 1D7675, 041D7675, 041D7656, 001D7675, 41D7675, and 41D7656. Always verify compatibility using the opener manual or replacement parts diagram before ordering.