The 041A5021-9G-315 is a replacement logic board kit for the LiftMaster ATS2113 opener, specifically units built between 1997 and 2005. It runs on the 315MHz Security+ frequency and you'll spot the purple learn button on the board. The kit comes with the logic board itself, an end panel, and a door control. If your ATS opener quit responding to remotes or the board took a power surge and died, this is the one you want. Also listed under part numbers 41A5021-9G and 41A5021-9G-315. Only fits the ATS2113 from those years though, so check your model and date before ordering.