trouble programming remote

I just received two of your small keychain remotes and can’t program them to my Lift Master. I have a red learn button. What remote will work?

It seems you purchased the C-SP-315 model, which is for Purple learn button only.
I have replied your message in Amazon messaging, thanks.

Bought your remote for my chambrlin security plus red button as a replacement after I program it it works for couple of times it opens and closes the garage door but the third time it stops working and I have to program it again to work for couple more opening .what I’m I doing wrong that the code is not storing in the remote .please help

@Ray, replied you via Amazon messaging system, thanks.