This was EXACTLY as advertised - a tested, WORKING circuit board to replace the failed board in my many-years-obsolete Liftmaster garage door opener. The listing includes the part number, as well as the models it works on Garagentor Ersatzplatine 41AB050-2 Chamberlain Circuit Board Purple Learn Button Used GUARANTEED To Work Hp 410 A Type: Circuit/Logic Board, Custom Bundle: No, Compatible Model: Chamberlain, MPN: 41AB050-1, Modified Item: No Genuine Chamberlain LiftMaster Receiver Logic Board 315 MHz Check compatibility before purchasing Ships same or next business day 41AC050-2, 41AC050-2M, 41AB050, 41AB050-2, 41AB050-2M, 41AS050R1 Gebraucht