searching for a waterproof learning remote

[Wiley1]

I need a remote that will do just these three things:

• Control a Tivo Mini
  Control power and volume on a Fosi amplifier
  Control power and a few other buttons on a Samsung TV

Seems simple, right? Except that I also need it to be fully waterproof.
I thought I had struck gold when I found this learning remote that floats in my hottub:
https://www.ebay.com/itm/224433405063

It works nicely with built-in codes for the Samsung and learned codes for the Fosi. But, I have been unable to get it to learn any Tivo code.
So, I need to find a way to make this remote do the job, or find another remote that meets my requirements.

Is there something non-standard about Tivo codes that makes them incompatible with my learning remote?

Is there a waterproof remote out there someplace that can learn Samsung, Tivo, and Fosi?

I've tried everything I know to get the WP-1545AL1 to accept Tivo codes but nothing has worked. Does anybody have any suggestions?

[The Robman]

There's nothing special about the Tivo remote signal that would make it hard to learn, it's very similar to the NEC1 signal.

If you search for "waterproof universal remote" on ebay, there are lots of hits:
https://www.ebay.com/sch/i.html?_nkw=wa ... sal+remote