Due to government regulations some wireless products will not work in certain areas. This product works on the J9 frequency band. The SVX4 Diversity Receiver is a single channel receiver for use with Shure SVX Wireless systems. The SVX1 Bodypack Transmitter can be used with the SVX Lavalier or Headworn Wireless system. The PGA31 performance headset microphone for general, speaking and performance use is a permanently-biased electret condenser microphone. Available as an included option for many systems, it also makes a viable replacement option for use in existing systems. The wearable design offers improved comfort and a secure fit for hands-free operation in any situation, while the unidirectional (cardioid) pickup pattern provides excellent off-axis rejection for higher gain-before-feedback when using a stage monitor.