astonishing 40

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The sound is pretty good. It is not in the top quality range but good bass and no crackling.
Easy to use.
A controllable ear. It allows to avoid the temptations in poorly frequented locations.
Very low price: no fear of theft or loss :).
Works perfectly with android.
Very light and small: easy to carry.
I do not earache (surportable serves a little but even on the length)
Charging by USB. A transformer less to carry while traveling.
Carrying pouch with livery.
Possibility to answer the telephone with. Given the remoteness of micro AC is an extra thing.
EDIT: the surprising autonomy

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Look pretty lousy overall
Is a bit "plasticky"
Malfunctioning windows 7 - 64bit Version. Maybe because of my bad configuration, but the fact is that it works badly. Android with no worries however.
Mini USB Charging by a micro usb by reloading would permi to pack a single cable with the phone when traveling.
Serves head a little if it then adjusts wrong and causes a little pain.

EDIT: considering the price (20 at the time) and product satisfaction after a few days I rejoute a star