Audio 2000s AWM6528H3L 4 Channel UHF Wireless Microphone with 3 Handhelds & 1 Lapel (Lavalier). UHF Band Frequency 551-581 Mhz 50 Selectacble frequencies per channel and up to 12 systems can be used simultaneously. Four Independent XLR Balanced Audio Outputs One 1/4" (TS) Unbalanced Mixed Audio Output Four Volume Control Knobs (One for Each Channel) at the Front Panel