Shure BLX1288/P31-J11 Headset And Handheld Combo Wireless System Frequency (J11: 596 to 616 MHz)Key Features For Two Presenters or Performers PGA31 Cardioid Headset Mic Lightweight Bodypack Transmitter PG58 Cardioid Mic Transmitter Dual Channel Tabletop Receiver 123 Auto Scan Frequencies Internal Antenna Diversity 14 Hr AA Batteries Expandable to 12 Mic Channels 300' Range The Shure BLX1288 PGA31 is a cost effective wireless headset and handheld combo microphone system for two presenters, performers, teachers, or lecturers which offers quality