The AmpliVox S1699 is an easy to use and affordable universal digital wireless behind ear microphone system. Its compact and lightweight design is a great solution for expanding your audio needs. Plug receiver into any audio device (microphone / line in jack) with a speaker and amplifier and start talking. Utilizing digital wireless technology, the S1699 operates in the 2.4 GHz range which is completely free of TV and radio interference. Set up is a breeze with automatic syncing between receiver and transmitter. Internal, rechargeable lithium ion batteries provide long lasting operation and easy charging via USB. The complete S1699 system includes the headset transmitter with specially designed boom microphone, plug in receiver as well as a dual USB charging cable for charging transmitter and receiver at the same time.