Model SC-186Kx2 Infrared Audio Transmitter
The Sound Choice Model SC-186K is a compact wireless infrared audio transmitting system. The unit is completely self-contained and includes a super-sensitive Sound Choice Special Design microphone or a Crown PZM® microphone (by special order only). Its high gain internal pre-amplifier makes even the faintest sounds audible. The Sound Choice Model SC-186K system incorporates a powerful infrared emitter which broadcasts audio over invisible infrared light waves. The infrared transmission is received by high-gain headsets worn by those needing hearing assistance. Styled in a dignified natural wood case, the transmitter blends with both traditional and modern government, courtroom or commercial settings.
More information: http://www.assistivelistening.net/sc-186kx2/sc-186kx2_main.html