Response frequency: 20 ~ 22000Hz Impedance: 32 Ohm 114 dB sensitivity Contains a built-in microphone Battery charging time: 3 to 7 hours Weight: 205g Box included: 950 headphones + USB cable Memory Card Input (up to 32 GB) P2 cable entry Built-in microphone – Fm radio connection – Charging time: (approximately): 4 hours Battery life: 16 hours (depending on your continued use)