Samson AirLine 77 AH7 Wireless Fitness Headset Microphone System (K4: 477.525 MHz)

Up to 300' (90m) operating range (line-of-sight) Available in multiple channels (region dependent) Samson AirLine 77 AH7 Wireless System Fitness Headset (Channel K4)You may also like Samson Airline 88X Headset Wireless UHF Microphone Fitness System 100-Ch. D-Band.