... .Sensitivity:100dB/mW 3.6-23, 000Hz 4.OEM design,CE,RoHS 5.Colours:Black/white/pink/bule 1, Powerful, bass ... the delivery) 4, Ldeal for use with all MP3, CD, VCD, MD players and portable game 5, Systems with headphone sockets 6 ... : 6-23, 000Hz 10,To bear the greatest power: 100mW MP3 Earphone