Brand New Vocopro Uhf-5900 Professional UHF Wireless Microphone System w/ Carrying Case + 4 UHF Wireless Microphones Frequency Scan Feature Finds Interference Free Frequencies More Than 150 Wireless Frequencies To Choose From 19" Rack Mount Compatible, Uses Only 1 Rack Space Independent Channel Power Switches And Volume Controls Operates In The FCC Compliant 600MHz Band