WIRELESS SYSTEM: LAVALIER (LAPEL) The XPD2m portable dual-channel digital wireless system offers two independent channels of high-quality wireless audio, ideal for group presentations, educators, question and answer sessions and more. Operating in the 2.4GHz license-free frequency band, XPD2m offers simple setup and robust wireless operation in a portable package. The system is composed of a RXD2M receiver and two HXD1 transmitter microphones. Check specifications and more details at: http://www.samsontech.com/samson/products/wireless-systems/xpd-series/xpd2mhh/