Shure PGXD14/85-X8 Digital Lavalier Wireless System with WL185 Lavalier Microphone The rugged PGXD1 body pack transmitter easily clips onto a belt or guitar strap, and provides you with a 20Hz - 20kHz frequency range, up to 10 hours of continuous use on 2 standard AA batteries (not included), and 200' of wireless freedom. The PGDX4 receiver offers 24-bit/48kHz accurate sound, offers technology for incredibly accurate sound, auto frequency selection, and greater reliability thanks to its true digital diversity. The WL185 is recommended for general purpose sound reinforcement applications requiring good rejection of ambient noise. Use of the included windscreen is highly recommended. It has a pickup angle of 130 degrees.