Integrated headset microphone and transmitter for AirLine 88x systems. The AH8 Fitness Headset Transmitter combines a compact micro-transmitter with an adjustable gooseneck in a low-profile headset, and includes an 8-hour rechargeable Li-ion battery. Features gain and mute controls, IR sync for frequency alignment, water-resistant materials, and a 300 ft line-of-sight range at 10 mW EIRP. It is a self-contained headset transmitter (no beltpack required) compatible with AirLine 88x receivers.