I see that Deteknix has a wireless setup for around 90 bucks made specifically for metal detectors.
wire-free wireless headphone kit
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I've read some positive reviews. If this setup is as good as the XPointer than it could be a winner. I still want to wait a while until the jury's in though.
I'm usually a bit leery of new products and like to see what actual users have to say after some time has passed. I also like to see if the price comes down or if someone else comes up with something similar at a better price.
They look and sound pretty good so far and IMO, 90 bucks isn't too unreasonable IF they're built to last. That's the big question for me.
I know I've beaten the living hell out of my XPointer and it's still working like the day I got it. The camo has pretty much worn off but that's not a problem for me.
I really don't like using wired headphones despite the fact that so many people swear by them. I bought a really nice set of headphones early on and found myself preferring my Apple ear buds over them. But overall anything with a cable just gets in my way far too much; especially in some of the areas I hunt in the woods where there are so many sticker bushes, vines,low hanging branches and other obstacles to get snagged on. If I'm hunting an open field it's a different story but I'm hunting fewer fields these days.
But OTOH, once I go wireless I can't see myself hunting without them.