Not all garage door remotes work the same way under the hood. Older systems use what's called fixed code technology, while virtually all modern openers use rolling code technology instead. The difference matters more for security than most homeowners realize.
How fixed code remotes work
A fixed code remote transmits the same static signal every time you press the button. That signal is set once, typically via small DIP switches inside the remote and receiver, and never changes. This was standard in openers manufactured decades ago, but it has a well-documented weakness: the same fixed signal can be captured and replayed by a code-grabbing device to open the door without your remote.
How rolling code remotes work
Rolling code technology generates a new, unique code every time the remote is used, synced between the remote and the receiver using an algorithm both sides share. Even if someone intercepted a single signal, that code becomes invalid the moment it's used, making replay attacks impractical. Every opener we install, from the Chamberlain C2405 up through LiftMaster models, uses rolling code technology as standard.
What this means if you have an old opener
- If your opener is more than 20 years old and uses small DIP switches on the remote, it's very likely fixed code
- Fixed code systems are considered outdated for security purposes by today's standards
- Upgrading to a modern rolling code opener is a meaningful security improvement, not just a convenience one
Every new opener we install comes standard with rolling code security. Get your exact installed price through our wizard in about two minutes.