Sony MDR-EX90SL

It's sadly discontinued now, and i couldn't really find a Sony alternative at this price and value.
 
It looks good, the housing is made of strong high quality plastic and metal, sounds good and forgiving, and is comfortable with decent isolation.
 
Mine doesn't work anymore. To make the J-cable, Sony took 3 separate cables, each different in length and soldered them together. It ripped at the soldered section 4 or 5 times over the 6 years i was using it. I was able to solder it every but the last time. The strain reliefs also broke on both earpieces after a couple of years.
 
I'm going to try to avoid J-cables and go for Y-cabled IEMs.
 

Rest in pieces.

how to indentify if this headphone is origina or not.

These are quite a nice sounding headphone for compressed music or bad sources. 
 
They are very smooth, balanced, if slightly grainy in sound at first, but later smooth out.
 
Compared to high end earphones they sound a little muddy, but if the mp3 is low quality this wont matter.  These don't have much bass or treble extension, official frequency response claims are nothing like what you hear - and a completely misleading form of data.
 
These are decent don't get me wrong, but nowhere near the top earphones from Westone, Shure etc.  
 
Not really audiophile material, but inoffensive and more than up to the task of portable audio.