The Linear ACT-21A MegaCode
The Linear ACT-21A MegaCode is a compact and easy to use single button remote transmitter that allows you to easily get in and out of your garage with the push of a button. It is compatible with all Linear access receivers and controllers and includes a the MegaCode technology is factory pre-programmed with one of over one million codes giving you the highest level of security. It has a unique 10-second time-out feature that helps conserve power by preventing the system from being shut down by a single transmitter transmitting continuously. This transmitter comes with a quick-disconnect key ring
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Batteries are hard to replace