The Sony MH755 is the bundled in-ear earphone for the Sony MW600, SBH20, SBH50, and SBH52 Bluetooth devices. Specifications Driver: Single 9.2 mm dynamic with neodymium magnet Frequency Response: 20 Hz to 20 kHz Sensitivity: 115 dB/V (100.5 dB/mW) @ 1 kHz Maximum input power: 70 mW Connector...