Etymotic mc3. Cable length: 1.2 m. Headphone frequency: 20 - 15000 Hz, Headphone sensitivity: 100 dB, Impedance: 16 Ом. Compatible products: - iPod touch (2, 3, 4) - iPod classic - iPod nano (4, 5, 6) - iPod shuffle (3, 4). Compatibility: Multi, Volume control: Digital