Dual Channel UHF Wireless Mic System, Frequency Sets: M, N Available Frequencies:. UHF-28 QR: Q, R / UHF-28 ST: S, T. Operates as a stand alone unit that can plug into. any system with a 1/4" input, or as a plug in. module for the SOUNDMAN, CHAMPION-RV or HERO-RV Shipping Dimensions:. 10.2" (L) x 14.25" (W) x 2.6" (H). Shipping Weight: 3 lbs FCC license may be required