Official Edifier W855BT Hi-Fi On-Ear Headphones

• Model: Xiaomi Wireless Bluetooth Headphones.
• Highlights: Waterproof, Bluetooth V4.1, Ergonomic Design.
• Noise reduction, Long battery life.
• Bluetooth Version: V4.1.
• Transmission Distance: 10m.
• Up to 20 Hours Music playing for full battery charge and 600 Hours Standby.   
• Can connect two devices at the same time.
• Frequency response: 20 - 20KHz.
  Impedance: 32ohms.
  Sensitivity: 98dB. 

Battery:  

• Charging Time: 4 hours
• Play/Conversation Time: 20 hours
• Standby Time: 600 hours(Max)
• Packing List
• Bluetooth Headphones x1, micro usb Charging cable x1, 3.5mm Audio cable