AirLine 99m Fitness is a frequency agile UHF wireless headset system comprising an AH9 micro transmitter mounted to the Qe headset, an AR99m tabletop receiver, and a windscreen-equipped AR99m. It offers 100 operating channels across 24 MHz, 300 ft line-of-sight range, 50 Hz–15 kHz audio response, true RF diversity, and IR sync, with XLR, 1/4 inch, and 1/8 inch outputs and up to 8 hours of battery life.