• Country
• Germany

• Manufacturer / Brand
• Sennheiser Electronic (Labor W); Wennebostel

• Year
• 1980/1981

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 182039

• Wave bands
• - without

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 2,4 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Drahtloser Infrarot Mono Hörer HDI406S - Sennheiser Electronic Labor W;

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Notes
• Empfang über Infrarotlicht mit Schalter und Lautstärkesteller, Trägerfrequenz 95 kHz, Modulation FM, , Übertragungsbereich 50 bis 8000 Hz. Akku Stecker: GZS406 ( 2,3-2,6 V ).

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Sándor Selyem-Tóth. See "Data change" for further contributors.

• Other Models

• Here you find 293 models, 278 with images and 134 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sennheiser Electronic (Labor W); Wennebostel