Shure BLX188/PG85 Wireless Combo System with PG185 Lavalier Microphones, J10 Included: BLX88 dual wireless receiver; 2 BLX1 bodypack transmitters; 2 PG185 cardioid condenser lavalier microphones with windscreens and tie clips Power and battery status LED Adjustable gain control Quick & easy frequency matching 2 AA batteries (included) provide up to 14 hours of continuous use 300 feet (91 m) operating range (line of sight)