The Keystone Heddolf C220-1KA is a single-button, Chamberlain and LiftMaster compatible garage door remote designed for legacy fixed-code systems that use a 9-position DIP switch. It serves as a dependable replacement transmitter for older Chamberlain, LiftMaster, and many Sears Craftsman openers that operate on 390 MHz with matching 9-switch coding, making it a practical choice for maintaining older residential or light‑commercial installations without replacing the entire opener or receiver.
Operating at 390 MHz with a fixed code, the C220-1KA pairs by matching its internal 9 DIP switches to the code set in your opener’s receiver or an existing working remote, then testing operation at the door. It is intended only for legacy fixed-code systems and is not compatible with Security+, Security+ 2.0, rolling code, purple/yellow learn-button systems, or 315 MHz platforms. Typical use includes replacing worn or lost remotes on classic Chamberlain/LiftMaster setups and compatible external receivers. For safety and performance, program the remote in a secure location, verify the garage door’s safety reversal system functions correctly, and keep transmitters out of reach of children. If your opener does not have DIP switches or uses a learn-button rolling code, select a different compatible remote or add a matching external receiver.