The handheld transmitters 4580 and 4550 are no longer available.
These handheld transmitters were used to control the Rator 4500 and Rator 8000 garage door openers and the 4530/4540 radio remote control. These devices have been discontinued since 2001.
There is no compatible replacement handheld transmitter.
In these cases the complete operator must be replaced.
Current garage door openers incl. handheld transmitter is the