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  2. Hearing protection device - Wikipedia

    en.wikipedia.org/wiki/Hearing_protection_device

    Earmuff style hearing protection devices are designed to fit over the outer ear, or pinna. Earmuff HPDs typically consist of two ear cups and a head band. Ear cups are usually lined with a sound-absorbing material, such as foam. The cups should be fit so that the center of the ear canal aligns with the ear canal opening. [1]

  3. Plantronics - Wikipedia

    en.wikipedia.org/wiki/Plantronics

    Plantronics office headset on its charger. In the 1980s, Plantronics created a line of cordless products using infrared technology. Though the technology utilized was the same one being used by television remote controls, the link did not require a Federal Communications Commission (FCC) telecommunications approval. One of the first products ...

  4. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    A headset is a headphone combined with a microphone. Headsets provide the equivalent functionality of a telephone handset with hands-free operation. Among applications for headsets, besides telephone use, are aviation, theatre or television studio intercom systems, and console or PC gaming.

  5. Kennedy Space Center Launch Complex 39 - Wikipedia

    en.wikipedia.org/wiki/Kennedy_Space_Center...

    At the time, the original three were named from north to south: Pad A through Pad C. [19] The pads were evenly spaced 8,700 feet (2,700 m) apart to avoid damage in the event of an explosion on a pad. In March 1963, plans were formalized to build only two of the three pads; the northernmost, furthest from the VAB, would not be built but reserved ...