Sennheiser - HDI - SI 405 Headphone





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Sennheiser HDI/SI 405 wireless infrared headset set from 1980 in excellent cosmetic condition and tested working, including original box, SI 405 infrared transmitter, power adapter and flight case.
Description from the seller
Sennheiser HDI/SI 405 Wireless Infrared Headset Set – Complete in Original Box
Original vintage Sennheiser HDI/SI 405 wireless infrared headphone system, offered complete with the SI 405 infrared transmitter, power adapter, and original retail box. A quality German-made audio system from one of the most respected names in professional sound.
Features:
* Complete set
* Original box included
* HDI 405 wireless infrared headset
* SI 405 infrared transmitter
* Power adapter included
* Made in Germany
A desirable piece for collectors, vintage audio enthusiasts, and fans of classic Sennheiser equipment. Presented in good cosmetic condition, exactly as shown in the photographs.
A rare opportunity to acquire a complete, boxed Sennheiser infrared listening system—an excellent example of late 20th-century wireless audio technology.
Sennheiser HDI/SI 405 Wireless Infrared Headset Set – Complete in Original Box
Original vintage Sennheiser HDI/SI 405 wireless infrared headphone system, offered complete with the SI 405 infrared transmitter, power adapter, and original retail box. A quality German-made audio system from one of the most respected names in professional sound.
Features:
* Complete set
* Original box included
* HDI 405 wireless infrared headset
* SI 405 infrared transmitter
* Power adapter included
* Made in Germany
A desirable piece for collectors, vintage audio enthusiasts, and fans of classic Sennheiser equipment. Presented in good cosmetic condition, exactly as shown in the photographs.
A rare opportunity to acquire a complete, boxed Sennheiser infrared listening system—an excellent example of late 20th-century wireless audio technology.

