Wireless headphones with refined design and aluminium finish, resistant and elegant. Comfort and audio quality at an affordable price. Bluetooth: 4.1 Version Operational distance: 10 M Battery: 80mAh Voltage: 3.7V Power: < 100mW Autonomy: 4h approx. Charging time: 1-2h Charging method: USB 5V Response frequency: 20Hz-20KHz Nominal power: 2mW Profiles: HFP/HSP/A2DP/AVRCP Impedance: 16 ohm +- 10% What's in the box 1 x headset 1 x USB cable