Bump because interested as well. Got an lbt and am pretty happy with it but the idea tubes(if effective/durable) beats the hell out of lifting up the "placard" and adjusting Velcro.
This is what I use. They are pretty damn great, but there are pitfalls. Basically as @The Southern Gentlemen said. They aren't hardwired and rely on wifi. A constant recorded feed is the tits. But these offer some good security for a far cheaper price.
That's awesome dude. Would take you up on it as I've been looking into one here very recently. I however very much have the specific genetic marker for a condition called noassatall. And therefore wouldn't be able to wear the band.