Line 6 XDR955 Handheld Digital Wireless Microphone system 24-bit A/D conversion; Extended frequency response (10 Hz  20 kHz) matches that of high-quality audio cables; Extended operating range (300-foot line-of-sight); Expanded dynamic range (&gt;115 dB); Compression-free signal for a wired sound Cardioid microphone polar pattern; 8 hours of continuous microphone battery life Exclusive dual-RF anti-jam technologies provide immunity from static, interference and dropouts; 5 compatible user-selectable channels (can be used simultaneously) Roams freely throughout the United States and Canada; 2009 FCC/DTV compliant; One-year warranty Includes receiver with rack-mounting hardware, wireless microphone with transmitter, all necessary accessories including antennas, batteries and power supply 24-bit A/D conversion; Extended frequency response (10 Hz - 20 kHz) matches that of high-quality audio cables; Cardioid microphone polar pattern; 8 hours of continuous microphone battery life Exclusive dual-RF anti-jam technologies provide immunity from static, interference and dropouts; 5 compatible user-selectable channels Roams freely throughout the United States and Canada; 2009 FCC/DTV compliant; One-year warranty Includes receiver with rack-mounting hardware, wireless microphone with transmitter