Firefly 390LMD21K garage door opener keychain remote is a 9 dip switch, 390 MHz remote that is compatible with LiftMaster.

• 9 dip switch style 390mhz keychain remote
• 61LM LIFTMASTER only remotes with dip switches from 1984 to 1993
• Operates with LiftMaster receivers and transmitters
• Test/operate LED
• Keychain model
• Blue case
• Power: Long-life 12 V battery
• Frequency: 390 MHz
• Dip switches found in battery compartment