The Firefly 390LMPB1K is a one-button keychain garage door opener remote engineered to work with LiftMaster, Chamberlain, and Sears Craftsman operators that use the 390 MHz “Billion Code” radio system. This model is designed for units with a green learn button on the opener head and serves as a dependable replacement for LiftMaster Billion Code remotes such as 81LM, 82LM, and 83LM, as well as compatible external receivers using the same protocol. Compact and convenient for everyday carry, it’s ideal for residential or light commercial access control where a simple, single-button transmitter is preferred.
Programming is straightforward: press and release the opener’s green LEARN button, then press the Firefly remote button until the opener light flashes or clicks to confirm. The 390LMPB1K operates at 390 MHz to match the Billion Code platform and is not compatible with Security+ (red/orange or purple learn buttons), Security+ 315, or Security+ 2.0 (yellow learn button) systems. For safe operation, program the transmitter only when the door area is clear and ensure your opener’s photo-eye safety sensors are installed and functioning. This Firefly transmitter provides a reliable replacement/upgrade option for Billion Code systems in garages, gates, and entry receivers that support the 390 MHz LiftMaster Billion Code standard.