The Keystone Heddolf O219-1K-340 garage door opener remote control transmitter from Garage Door Supply Company is a 340MHz keychain remote programmed using nine dip switches. This one-button remote has a built-in keychain, and a battery is included. It's compatible with older 340MHz Overhead Door garage door openers with nine three-position dip switches. This Keystone Heddolf keychain remote is also compatible with340MHz Keystone Heddolf and Crusader garage door openers.
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