Learning New remote controls?

[shallow thoughts]

I have the 2ch RF remote control. It is 433mhz so I picked up a couple extra remotes to use with it, but they dont work?

The info on the back of the unit says 2A 1527 433mhz. I purchased 433mhz remotes. I also cleared the memory for the unit with no luck. I was able to get the original remote to work perfectly first try.

Am I missing something?

Thank you.