In ear earphone 1,Powerful drive unit: 9 mm diameter 2,Sensitivity: 100dB ... good attenuation of ambient 3,Noise due to ear-fit rings in different sizes(included in the delivery) 4, Ldeal for use ... and portable game 5, Systems with headphone sockets 6, In-Ear Headphones classic models. Two-turbine effectively enhance the sound coil ... 6-23, 000Hz 10,To bear the greatest power: 100mW In-ear earphone