The Samson AirLine 77 AH7 Headset system is a wireless microphone solution designed to meet the specific demands of presenters, singers and other active performers. With the unique AH7 micro transmitter mounted to the low-profile DE10x headset microphone, you can free yourself completely from cables and beltpacks for a truly exhilarating and motivating experience. Operating for up to eight hours on a single AAA battery, the AH7 transmitter is attached to the low-profile, adjustable DE10x headset that features a miniature condenser microphone with an omnidirectional pickup pattern. Also, the system's CR77 True Diversity half-rack receiver provides reliable performance with up to 300' (90m) of wireless operation.