The LiftMaster 300MC is a one-button visor remote transmitter designed to work with Multi-Code 300 MHz radio systems that use 10 DIP switch coding. Ideal as a replacement transmitter or spare for garage door openers and gate operators, it provides reliable, simple operation for residential or light commercial applications that use Linear/Multi-Code style receivers. Operating at 300 MHz with a fixed-code 10-switch format, this remote is not compatible with rolling-code systems such as LiftMaster Security+, Security+ 2.0, Genie Intellicode, or other non-300 MHz platforms.
Programming is straightforward: open the remote’s case, set the 10 internal DIP switches to match the corresponding 10-switch code on your Multi-Code-compatible receiver or existing working transmitter, close the case, and test the system. Typical use cases include compatibility with Multi-Code 300 MHz 10-switch receivers and transmitters often referenced in the field (for example, commonly used in systems equivalent to Multi-Code 3089-style configurations). The 300MC is a single-channel transmitter with a visor clip and transmission indicator, making it a practical replacement part or upgrade for users standardizing on Multi-Code 300 MHz systems. For safety, keep remotes out of children’s reach and verify proper opener/gate entrapment protection; only use where line-of-sight operation is safe and test operation after programming.
