Shure BLX188/CVL Dual-Channel Wireless Cardioid Lavalier Microphone System (H9: 512 to 542 MHz) For Two Presenters or Lecturers, 2 x CVL Cardioid Lav Mics, 2 x Lightweight Bodypack Transmitters, Dual-Channel Tabletop Receiver, 123 Auto-Scan...