Hisonic HSU482H 48-Channel Dual UHF 600MHz Wireless Microphone, FCC Certified PLL Synthesized UHF 600 MHz System with Auto-Scan Frequency Pairing Long-range transmission, up to 300 feet Rack-mountable and multiple frequency available for easy system expansion Compatible Headset or Lapel Microphones can be purchased separately Plastic carrying case provides excellent protection and portability