The HTC One smartphone came with a programmable IR port. All you had to do was determine the TV brand (easy if you can see it), then point the top of the phone at the TV pushing the "power" button until it went off. Then you knew you had the right configuration.

I mostly used it for turning volume down in waiting rooms or at bars, but a bar was also where I figured out most of their TVs tend to be set to the same control because they had a few with their sensors in a line where I was sitting and they all went off together while I was programming it.

One of the phone features I miss most, after the 3.5mm jack. Nobody needs to hear loud daytime TV in a waiting room.