I always thought some type of jack socket/port behind the ear where you plugged in an audio cable so you could hear music without using headphones would be quite cool.
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@Wildheart_Baby I have a pair of conduction-speakers which are bluetooth. pressing them into your skull is Amazing.
one into the forehead is good, but best placement found has been just below/behind each ear for sweet, sweet stereo.
not practical for roaming around (their main use is in the lad's carseat so he can have his own tunes on) but not massively $$$
