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These could only be used for radios and had no other use very big and inconvenient.
Products Vs System
this product always needed a system to tell it what sounds to play and this has always been the case throughout all its development of this product.
Social Environment
because this was a new invention this was only used for occasional use when they were required because they were not common to own

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This was one of the first headphones, it has its own device to listen to music to and is very large and inconvenient to carry. and the headphones are large and hard to store.
Fully Realised

This was the time that the headphones were first used to listen to music and it most used purpose was realized
Physical Environment
This was the first time we saw these used in day-to-day life around schools and in towns

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This was the next design for headphones, they still need there own device at this time but now the headphone could fit in the ear and are much easier to use.
design elements
is was designed to fit easily in the ear and stay in there it was also made to be convenient to carry and sell
Malfunction
the wire connecting the earphones could break and render the earphones useless

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Now they were designed to fit into phones and they were designed to be smaller and more portable.
Physical & Functional Nature
it works by plugging into the phone and audio plays out the headphones rather than the speaker on the phone its small and a sleek design
Intended & Alternative Functions
the intended function was to listen to music, alternative functions would be to tie two things together, strangling wire, and scrapped for a small electrical wire.

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now they were designed to connect wirelessly with Bluetooth and they are smaller with a little port.
Historical Context
headphones have developed to the point of being small and wireless primarily to be more convenient and useable due to their large popularity.

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This is what I predict headphones will look like in 2050 they will be small easily portable, unnoticeable, they wont block the ear, and they wont be able to fall out.