Pro Executive Black Silver Stereo Handsfree Headset Mic Earphone for Samsung A167, A177, A237, A257 MAGNET, A517, A637, A737, A747, A767, A777, A827, A837, A867 Eternity, A877 Impression, A887 Solstice, i325, i617, i627 Propel pro, i637 Jack, i907 Epix, i910 Omnia, M200, M510, M520, R200, R500, T109, T119, T139, T229, T239, T339, T349, T439, T469 Gravity 2, T539, T559 Comeback, T659, T729, T739, T749 Highlight, T919 Behold, T929 Memoir, U650 Sway Frequency Range: 20Hz~20kHz Sound Pressure Level: 107dB3dB/100mW Total Harmonic Distortion: &lt;=5,(Input Power: 10mW; Frequency Range: 20Hz~20kHz) Crystal clear and high quality voice for both talking party, noise cancellation High velocity element for excellent stereo effect