The Shure ULXP4 Professional wireless receiver offers an exceptional value in both performance and price, for both working musicians and sound installers. The expanded feature set of the ULXP4 wireless receiver, with advanced settings and controls including lockable settings and group scan, offers a direct path to full, clear audio signals. Over 1400 selectable, pre-programmed frequencies between 554 and 590 MHz are available, and Automatic Frequency Selection provides a straight shot to a clear channel.