
Transmitter Solutions
The Firefly 315LMD21K Remote is a compact keychain-style transmitter designed for convenient, reliable control of LiftMaster garage door and gate operators. With its lightweight design, intuitive one-button operation, and strong signal transmission, this remote is both portable and dependable.
Part Numbers:
New: 315LMD21K3
Alternate: TRAFIR315LMD21K
Design: Grey button with blue case; clip-style keychain for portability.
Indicator: Red LED shows battery strength and confirms signal transmission.
Security: 9-position trinary dip switches offering 19,683 digital code combinations.
Accessories: Includes directional visor clip and 12V battery.
Frequency: Operates on 315 MHz.
Compatibility: Works with all 315 MHz LiftMaster gate operators and radio controls using 9 trinary dip switches. Compatible with LiftMaster 361LM openers.
The Firefly 315LMD21K is the perfect portable remote solution for controlling your LiftMaster garage door or gate system with ease and security.