First of all, it was received very quickly. The quality is fantastic. I am using my Sennheiser, Mic with them and the quality is every bit as good as when plugged in to an XLR cable. We had our first gig the other night where I used this. It was stated that it would last for eight hours, and although we only played for five, it still had two bars of battery left on both transmitter and receiver. Would highly recommend to anyone. Oh, one more thing. When testing it at home, I walked at least 120 feet from the receiver and the sound quality was still great.