The Keystone Heddolf M219-1K is a single-button keychain remote designed to operate Multi-Code format gate operators and garage door openers using the 300 MHz radio frequency. Engineered as a compact, on-the-go transmitter, it uses a 10-position DIP switch coding system to match your existing Multi-Code receiver or transmitter, delivering straightforward, single-channel control for residential or commercial access applications. It’s an excellent replacement part or upgrade for users standardizing on Multi-Code 300 MHz systems and seeking a reliable, pocket-friendly remote.
This Multi-Code compatible keychain remote programs by opening the case to set the 10 internal switches to the same on/off pattern as your receiver or working remote; no special tools or software are required. The M219-1K works with Multi-Code 300 MHz radio receivers commonly found on garage door openers and gate operators (such as many Linear/Multi-Code 1090/1099 series units), and it can functionally replace legacy Multi-Code transmitters like the 3060 or 3089 when used with a compatible receiver. It is not compatible with rolling-code systems or other formats/frequencies such as Linear MegaCode (318 MHz), Chamberlain/LiftMaster Security+, Genie Intellicode, or 390/315 MHz platforms. For safety, program the unit away from moving doors/gates, test operation at a safe distance, and keep remotes out of reach of children.