Sony extra bass earbud headset powerful sound specially designed drivers with high-energy neodymium magnets deliver deep, powerful bass that perfectly complements today's popular music genres. A tightly sealed acoustic design allows for a high level of sound isolation which aides in the reproduction of powerful and extended bass response. Smartphone playback control the integrated microphone and multifunction control button make the mdr-xb50ap the perfect companion for your smartphone. Android users can also enjoy the convenient smart key app for added control functionality directly from your smartphone. Comfortable fit, convenient case & tangle free cable hybrid silicone ear-buds provide long lasting comfort and designed to reduce ambient noise; x-small, small, medium and large ear-buds are included to fine tune your fitment. 

• Sensitivity (db): 110 dB/mW
• Frequency Response: 4 - 24,000 Hz
• Microphone: Elecret condenser / Omni Directional
• Remote Control: Multi-function button / SmartKey app
• Plug: Gold-plated four-conductor L-type stereo mini plug