VocoPro UHR 4 Rechargeable UHF Wireless Microphones with Chargers Upgrade Kit 900MHz

Frequency sets: UHR-9: 9A, 9B, 9C, 9D 900MHz Must be used with existing compatible systems ONLY compatible with UHF-5800, UHF-8800, PA-MAN, PA-PRO 900 while run with 900MHz Not a stand-alone unit, must be used in combination with a compatible unit FCC license may be required