The AH1 Headset Transmitter mounts right on to Samson's comfortable and lightweight headset. Incredibly small, the AH1 still features an easy-to-reach Power On/Off switch; an Input Sensitivity control to adjust the mic level; a Mute (Audio on/off) switch and a multi-function LED that indicates when the transmitter is on and when your battery's running low. And the AH1 comes equipped with with either the Samson Qe fitness microphone which is ideal for vocal reproduction or the Qv vocal mic with a balanced response for performance. Samson's breakthrough micro circuitry allows the AH1 to operate on a tiny triple-A battery with 14-hours of life. Plus AirLine transmitters give you great sound and reliable wireless reception over long ranges, wherever you use it. And UHF (Ultra High Frequency) means your wireless system is operating on a much clearer frequency band with less interference.