Early mobile phones and mp3 headphone jacks, headphones can be mixed, mainly in-ear headphones. Now smartphones have basically cancelled the separate headphone jack, and changed to use a headphone adapter to share with the USB interface, and most headphones are in-ear. The way of wearing in-ear head
Earplugs and other small in ear headphones may be very suitable for us to listen to music and podcasts on the road, but if you want good noise isolation, a pair of strong in ear headphones is a good choice.
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