However, when you push the button on the remote to open your garage door, nothing happens. You try pushing it again, and the door still doesn't move at all. Remotes that open our garages at the ...

(Get one, it’s easy.) In the USA, the equivalent band is at 315 MHz, which is why garage door remotes usually come with a 315/433 choice. Either way, check your local laws before you transmit.] ...

You'll often see the terms "universal garage door opener" or "universal garage door remote" suggesting that a generic garage door opener will work with any type of garage door. Is that true?

Any info (the door codes that have been sniffed) is displayed through a 4-bit interface on the LCD, for easy recording. With the codes, one can configure another garage remote to open the door.