1.In ear earphone for iphone 2.Sensitivity:100dB/mW 3.6-23, 000Hz 4.OEM design,CE,RoHS 5.Colours:Black/white/pink/bule 1, Powerful ... 3,Noise due to ear-fit rings in different sizes(included in the delivery) 4, Ldeal for use with all MP3, CD, VCD, MD players ... and portable game 5, Systems with headphone sockets 6, In-Ear ...