Shure BLX188/CVL/630 Dual Channel Lavalier Wireless System Combo with Mini Headset Includes BLX88 dual-channel receiver, 2 BLX1 body pack transmitters, 2 CVL Lavalier microphones, Lavalier clip, windscreens, and 2 AV-Jefes AVL630 Tan Color Mini Headset mics Power and battery status LED Adjustable gain control Quick & easy frequency matching 300 feet (91 m) operating range (line of sight)