In-ear, MP3 compatible, Stereo Headphones - Ideal for use with portable audio equipment # Tech Spec's/ Type: Open-air, dynamic - Driver unit: 15 mm (0.6 in) diameter - Impedance: 16 Ohms @1KHz - Sensitivity (SPL): 105 dB/mW @ max.power - Power handling capacity: 100 mW max. - Frequency response: 20 Hz - 18 KHz @ -3dB - Cord length: m (2.5 ft) long - Plug: 1/8È Stereo mini-plug (¿ 3.5 mm / 0.1 in.) - Weight: 18 g (0.6 oz.) w/ cord.