Is the earphone plug (the one that plugs into an intended device) a 90 degree or straight plug?
A 90 degree and can around your ear.
Is the headphone cable easy to entangle?
No, it is not easy to entangle. If so, can easily untie.
Is this earphone easy to drop from the ear?
No, it is designed for ergonomic. You will feel comfortable even though you wear them for a long time. But to prevent possible hearing damage, please do not listen to high volume levels for long periods.
What is the difference between mic and no mic?
If you choose with mic, then it will contain the functions ( Support volume +/-, change the song, play/pause, answer, and end call ).
If you choose no mic, it can only listen to music and no other functions.
How to change cables?
Any kind of 0.78mm 2 pin Detachable Hifi Audio Cable with 3.5 mm plug can be changed to. Different cables make different auditory enjoyment.