VOCOPRO UHF-5816-T1 Wireless Microphone System 4 Handhelds With 16 Adjustable Frequencies Each 4 Independent Balanced XLR Outputs Operates In The 900Mhz Band Free Of Typical TV Broadcast Interference 1 Mixed  Unbalanced Output Individual Volume Controls For Precise Balancing Field-Replaceable Receiver Modules Rugged 1RU Metal Receiver Chassis Dimensions: 19(W) x 8.2(D) x 1.8(H)