700 Series Unipak Frequency-agile Diversity UHF Wireless Systems Includes PRO 8HEcW Headworn Microphone 8 Selectable UHF Channels Auto Frequency Scanning Use up to 8 Systems simultaneously Includes PRO 8HEcW Headworn Microphone 8 Selectable UHF Channels Auto Frequency Scanning Use up to 8 Systems simultaneously Professional features and sound quality unheard of in its class.