Have you heard of wireless microphone system or wireless diversity receiver? And why is a true diversity receiver required for professional performances? Simply because it gives crystal-clear sound beyond the limits of conventional wireless technology and shure slx4 is one to reckon with. The Shure SLX4 wireless receiver is a breeze to use with Automatic Frequency Selection and Automatic Transmitter Setup . Comes included rack hardware and detachable antennas and the receiver is ready for immediate installation right out of the box. You can check out their website for more informative.