Replacing or adding a garage door remote is usually pretty easy. Most garage door openers in use today use a “learn code” programming method that is simple for homeowner to use, and compatible remotes are readily available.  Even older “dip switch” style remotes are easy to replace on most models. The Clicker KLIK1U Universal 2-Button Garage Door Opener Remote works for most major brands (including LiftMaster/Chamberlain/Sears-Craftsman and Genie/Overhead Door.  It also works for “dip switch” style programming on older models with external receivers.  This is your best bet if you are unsure exactly which garage door opener you have. It does not work with Wayne Dalton or Marantec.   Chamberlain and Genie/Overhead Door both offer remotes that are fully backward compatible with older learn code openers. The Chamberlain / LiftMaster / Craftsman 953EV 3-Button Garage Door Opener Remote, Security +2.0 Compatible, Includes Visor Clipcan control up to three Chamberlain manufactured garage door openers, even if they are different models. The Genie G3T-R Intellicode2 3-Button Remote (Works With Genie Garage Openers Only) also works up to three doors, and is compatible with Intellicode (and 2.0) and Overhead Door Code Dodger(and 2.0). The Garage Door Parts Marantec 65892 Garage Door Opener Remote is the only remote that will work with Marantec openers (must be 315 mhz). 2- Button Remote for Direct Drive Garage Door Opener Linear Megacode MCT-3 3-Channel Visor Transmitter