OK, this is a confusing topic, but if you have an LG television and lose it, you can't actually turn the TV on. I know this because I spent 30 minutes looking for a remote that was under a chair.
We wanted to figure out what backup remote to buy. This is a confusing topic as there is a new remote every year and it is not clear what is compatible with what. So with last year's LG OLED55B9PUA, it comes with an AN-MR18BA remote. The main question is can you use them in a backward compatible way.
But what works with what. The LG site is sort of useless because it basically says a remote only works with a particular model year.
However, Tab-TV has a great explanation. They basically have a Magic Remote protocol that displays a pointer on the screen using Bluetooth or a "dumb remote" that doesn't.
The reason this matters is that older remotes are obsolete and their prices are very high. AN-MR19BA for instance is $50 on Amazon and it works with 2019, 2018 and 2017 models. So you can buy a newer remote potentially at half the price. The AN-MR18BA for instance is $50 if you can get it and works with OLED W8, E8, C8, B8, and then the SK9500 NanoCell models.
These are called Magic Remote's by the way.