Universal 3.5mm Stereo Handsfree Stereo Headset 715, Purple Frequency Range: 20Hz~20kHz Sound Pressure Level: 107dB3dB/100mW Total Harmonic Distortion: &lt;=5,(Input Power: 10mW; Frequency Range: 20Hz~20kHz) Available in various colors and designs to meet customer needs. Crystal clear and high quality voice for both talking party, noise cancellation, high-velocity element for excellent stereo effect.