LiftMaster 33LM Garage Door Opener 390MHz Review

LiftMaster 33LM Garage Door Opener 390MHz is compatible with a multi-function remote control that can be operated to three residential garage doors. This door opener can be installed easily and works as advertised.

Basic Specifications

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LiftMaster 33LM Garage Door Opener 390MHz consists of three-button door control for open, close and stop. It can activate up to three one-channel radio receivers or a single 423LM 3-channel receiver. This garage door opener is lightweight at 3.2 ounces and has a dimension of 4.8 x 4.7 x 2.6 inches. A 12-V alkaline battery is included in the package to which a RED light is the battery indicator. LiftMaster 33LM can be activated up to three one-channel radio receivers. It can also be transformed into a single 423LM three-channel receiver.

Tips on How to Program (or Reprogram the Item) Plus Compatibility with other Remotes

LiftMaster 33LM Tri-Colored remote is a 3-channel billion code transmitter that compatibly works with LiftMaster, Chamberlain, and Sears openers running on digital systems from 1982 to 1992. It also includes a Smart coding systems button made from 1993 to 1997.

This is a very simple garage door remote and very easy to program. It has a reliable signal transmission distance and basically works as stated. The LiftMaster 33LM can also work for large industrial doors.

To use it, the green button is basically recommended for garage door opener use. The other buttons can be used as opener or light control. Code switch 1 on the 3-button transmitter is dormant especially when used with a one-button transmitter. In the single-button transmitter, you can easily set code switch 1 to match that push button on the 3-button transmitter.

There are also separate instructions whether your unit has a ‘Learn’ button or has code switches.

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