This is a Wired Headset Choose these MDR-E9LP earbuds for their classic style and clear audio quality. You will also enjoy their super lightweight design and powerful bass from 13.5mm driver units sporting neodymium magnets. Specifications Audio - Driver Unit : 13.5 mm, dome type (CCAW) - Frequency Response : 18 - 22,000 Hz - Impedance : 16 ohms at 1 kHz - Sensitivity (db) : 104 dB/mW General - Design : Earbud - Headband : None - Magnet : High-energy Neodymium (300 kJ) - Plug : L-shaped stereo mini plug - Type of Use : Portable - Speaker Type : Open-air, dynamic - Power Handling Capacity : 100 mW (IEC) What's in the box Sony MDR-E9LP Stereo Earbuds