This great unit from Liftmaster is a direct replacment for your Sears Craftsman 139.53681 / 139.53681B remote control.  If your current remote has a BLUE button(s) or the learn / SRT button on the opener is ORANGE or RED, then this is the correct unit for your opener. Programming is simple just press the programming button on the opener then press the button on the remote and you are ready to go.