Remote O&O T-Com R4-2
The T-Com R4-2 is a 2-channel remote that functions on the frequency of 433MHz. Aside from that, you can get plenty of utility out of this remote thanks to its 2 channels allowing you to operate multiple doors or gates.
Important to know:
This is the remote with red buttons which functions on 433MHz. There is also a version with orange buttons which functions on 868MHz. These remotes can't be used interchangeably, so make sure you pick the correct frequency.
Programming your remote:
Self-learning from remote to remote, possibly near the receiver.
Program directly to the receiver. Consult the manual of your controller/opener/receiver.