AUX is perfect for voice-over-IP (VOIP), online chat, gaming, and other applications. Name: OVLENG The OV-Q6 model 40mm is the speaker's diameter. 32 ohms of impedance Sensitivity: 1kHz, 102dB+/-3Db Response to frequency: 20 Hz to 20,000 Hz Maximum power input: 120 mW Type of plug: AU Headphone weight: approximately 241g/8.5oz; XC cable length: approximately 2.1m/6.9ft The package There is one headphone included.