... 1200pcs 4.OEM acceptableaa 2012 super bass HI-FI stereo headphone with microphone&volume Stereo headphone specification: •Dynamic deep bass sound. ... sound, MP4 or other standard stereo system, etc. •For earphone, acoustics, please correct best headphones. The headphone, RL for ... volume, slowly adjust volume, lest damage hearing and damaged headphones. •For not affect service life of the product, ...