This LiftMaster 85LM power adapter can be used with ALL types of add-on wire-in gate and garage door opener receivers.  When adding a new radio receiver to many older LiftMaster, Sears, or Chamberlain openers you’ll notice the opener will have 2 or 4 screw terminals on the back of the opener rather then the 3 most newer openers have.  This prevents you from being able to directly power a LiftMaster 535LM or 355LM radio receiver from the opener.   This transformer will plug directly into the unit allowing you to plug into any standard 110 volt outlet and power the radio receiver.