The Shure BLX188E/SM31-S8 Wireless Headset System is a high quality analogue wireless dual system designed for fitness instruction and includes 2 x SM31FH headsets. The condenser microphones offer a hands-free performance with durability and comfort. The system includes 2 x SM31 Fitness Headset Microphones along with 2 x BLX1 Bodypack Transmitter and a BLX88 Dual Channel Wireless Receiver to offer superior hands-free performance for a wide range of applications. The inclusion of 2 x SM31 headsets makes this system suitable for classes where two instructors are needed.