Sorry I should have piped up sooner. I had researched these a while back for LOS quads. When I moved into the FPV i didn't see the need as I have a DVR that can replay footage and help me locate a downed quad. For LOS I would for sure use one of these as I have spent many hours looking for a LOS that I saw where it went down and was stepping all over it before finally finding it the 3rd time I went out to look, the two prior times I spent about 3 hours looking!
The only question is how audible they are at 75db. I am not sure where that falls in the sound category as far as loudness goes.