The 041AC075-2S logic board fits LiftMaster Deluxe chain drive and belt drive openers from 2005 to 2015. it is a 315MHz Security+ receiver board with the purple learn button. Works with single or dual capacitor setups depending on the opener model. Compatible models include 3575S, 3585S, 3595S, PD752D, and PD758D. When your opener's gone unresponsive or the remotes stopped working, the board's probably the issue. Sometimes called 41AC075-2S or 41AB075-2S. Just confirm the model, year, and capacitor config on your unit before you buy.