Xstars W4000  Over Ear Design Headphone Stereo HiFi Sound Deep Bass with Microphone
Features:
  • Bluetooth: 4.2
  • Speaker driver diameter: 40mm 
  • Speaker driver sensitivity: 110dB±3dB
  • Impedance: 32Ω±15%
  • Frequency respond: 20HZ-20KHZ
  • Battery capacity: 250mah
  • Music play time: 12h; Call time: 16h;
  • Charging time: 2h; Stand by: 200h
  • Charging port: Micro USB
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