In ear earphone 1,Powerful drive unit: 9 mm diameter 2,Sensitivity: 100dB ... 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 Headphones classic models. Two-turbine effectively enhance the sound ... 6-23, 000Hz 10,To bear the greatest power: 100mW In-ear earphone