Samson AirLine 77 AH7 Fitness Headset system is a wireless microphone solution designed to meet the specific demands of fitness instructors and active performers. With the unique AH7 micro transmitter mounted to a sweat-resistant Qe fitness headset microphone, you can free yourself completely from cables and belt packs, ideal for aerobics, yoga, spin, zumba, boot camp, boxing and kickboxing classes for a truly exhilarating and motivating experience. This allows you to focus on your class or performance, and not have to worry about your audio. The AH7 micro transmitter is mounted directly on the headset. This is unique when compared to traditional wireless systems that typically use a belt pack with a wire running from the microphone to the transmitter. The transmitter operates for up to eight hours straight on a single AAA battery. The Samson Qe condenser microphone, whose sweat-resistant capsule prevents corrosion from moisture and sweat. The bidirectional pickup pattern reduces background noise, minimizes feedback problems and effectively rejects signals not originating directly in front of the mic capsule. The CR77 True Diversity receiver provides reliable performance with up to 300' (90m) of wireless operation. The rear panel features balanced XLR and unbalanced 1/4 outputs allowing it to easily integrate to any audio system. Its half-rack housing is light enough to throw in your bag, or it can be permanently installed with a rackmount kit (sold separately).