The Linear MegaCode ACT-21 one-button mini keychain garage door opener remote from Garage Door Supply Company is a 318MHz remote that's compatible with all Linear MegaCode 318MHz garage door operators, gate operators and receivers. This block-coded ACT-21 remote has no switches; program by pushing the button. A 3-volt lithium coin cell battery and key ring are included with your Linear MegaCode mini remote.
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