Features: 3.5 mm plug jack Type: Lateral, closed, dynamic Impedance: 16 ohms at 1 kHz Sensitivity: 100 dB/mW Power handling capacity: 100 mW Frequency response: 12 Hz-23 kHz All parts from original brand's factory for ipod nano, video, shuffle, mp3 in new sealed box Packing content: 1 X ipod earphone 2 X Ear Pad Foam Cover