• Speaker: 40 mm• Frequency range: 20 Hz-20 kHz• Power input: 500 mW max• Impedance: 32 Ohms (power on) 110 0hms (power off)• Sensitivity: 103 dB (power on) 100 dB (power off)• Cable length: 2 m• Package contents: NC-100 headset, AAA alkaline battery• Foldable design• 3.5 mm plug• Adjustable headband• Volume control• 80% Noise canceling