I’m assuming you want to use it for ice fishing. I don’t know anything about the units you listed but I do know that I wouldn’t trust my phone to stay on for the length of time needed for ice fishing. Being in the cold is enough to drain it. Start running apps and it’s going to happen quicker. You could use an external power source but then you’re just spending more money and bringing more things. In a heated shack would probably be alright but cell phones HATE cold weather. For what it’s worth, I have an iPhone 11 but that doesn’t matter. All phones hate the cold. If you were constantly in a warm shack, that would be a different story but I like to save my phones battery while on the ice. You never know what’s going to happen and I want battery left to make a phone call. You could always use a spare phone I guess so your primary “digital safety net” doesn’t die on you. Personally, I’d save for an actual unit. I know they are still at the cheapest a couple hundred bucks but you won’t regret it and you’ll wonder why you ever considered getting the “toy” versions.
Having said that, I’m sure you’ll get a proper response on how they actually work and I may be totally wrong and they could be awesome. But, if they were, I’d suspect there around be more than few threads about them already.
