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890MAX3-button mini / keychain. Accessory charts list compatibility with LiftMaster openers made since about January 1993 across Billion Code / Security+ / Security+ 2.0 learn-button eras.
Manual text: replacement for 80 / 970 / 370 series remotes when the opener is a compatible post-1993 unit. See learn-button guide for white-button / DIP exceptions.
Packaging variants seen in retail: 890MAX, 890MAXMC