The Keystone Heddolf M220-1KB is a one-button keychain remote transmitter designed to operate gate operators and garage door openers that use the Multi-Code by Linear 300 MHz fixed-code format. Compact and durable for everyday carry, this aftermarket replacement remote offers reliable, long-range operation for residential or light commercial applications and is ideal as a replacement, spare, or upgrade for older Multi-Code remotes.
Programming is simple: open the remote and set the internal 10-position DIP switches to match the code settings in your existing Multi-Code transmitter or the receiver connected to your opener. Once the DIP switches are matched, the M220-1KB transmits at 300 MHz to control compatible Linear/Multi-Code brand radio receivers that use fixed-code DIP-switch programming. This model is not compatible with rolling-code systems or other frequencies/brands (such as Security+ 2.0, Genie Intellicode, or 315/318/390 MHz platforms). For best results, confirm your system uses the Multi-Code 300 MHz format with DIP-switch coding before purchase and observe standard garage and gate safety practices during installation and testing.