«  Long live the wireless »

I use it for three months, including a concert hall with many issuers. Never a concern. This may be a little early to be definitive pure, but the lightness of plastic (any fall could be fatal ...) it works perfectly, and the feeling of freedom it gives is at the height of the investment. Especially when repeated in cramped places.
I did not notice the absence of frequency but I am far from perfect pitch.
I would do this choice without any problems.