This is a reletively new product that I will honestly say is the BEST $189 I ever spent for a piece of music gear. I play at a very large church 1 wed nt service and 2 Sun morning serviceseach week ( love it) We have a full blown band live amps /drums and we utilize Aviom in ear monitoring. I was looking for a wireless IEM that would not sacrifice my low end fidelity having about to yank over my avom mixer this past Sunday with my 20 ft ext cable I found this system for $189. I was a little skeptical because of price. I use this system with my Superphonics Atrios and finally cable freedom I kept the thing powered up from 4:45- 9:30 and still had power I got the 100 ft line of site as advertised. about 75 non line of site with no latency with my wireless guitar syst I use a Relay G50 wireless guitar system along with one of our guitar players no problem from either systems The Wi audio has a 15 hz to 20khz freq response I will try it as a inst wireless syst out of curiosity Again this system gets 2 thumbs up Here are some pix and by the way AMS will double 1 yr to 2yr warranty w free shipping.