Shure PGXD14/PGA31-X8 Digital Headworn Wireless System with PGA31 Headset Microphone Includes PGXD4 receiver, PGXD1 body pack transmitter, PGA31 headset microphone, 2 AA batteries, power supply, clothing clip, windscreens, carrying case, and user guide. 24-bit / 48kHz digital technology for incredibly accurate sound Scan and sync instantly and automatically sets up the system Up to 10 hours of continuous use from 2 AA batteries Up to 200 ft. (~60m) range for total wireless freedom