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 systemsONLY compatible with UHF-5800, UHF-8800, PA-MAN, PA-PRO 900 while run with 900MHzNot a stand-alone unit, must be used in combination with a compatible unitFCC license may be required
