Why always us?<br />1.Integrated microphone and call button<br />2.Small efficient speakers reproduce precise sound with bass<br />3.Ultra-small for snug comfy in-ear fit<br />4 interchangeable rubber ear caps for optimal fit in all ears<br /><br /> Brand: ROCHE<br /> Style: in earphone<br /> Usage: MP3/Phone/Computer<br /> Receiver:  10.0mm <br /> Impedance: 16  <br /> Sensitivity: 105dB+/-3dB at 1KHz<br /> Frequency Response: 20-20kHz<br /> Cable Length: 1.2m<br /> Plug Type:Straight 3.5mm Golden<br /> Material: Metal<br /> Mic: YES<br /> Voice control: NO<br /> Color: Silver