BT function
  TF Card support
  Material  ABS
  Battery capacity  400mAh
  Battery voltage  3.7-4.2V
  Frequency response  100Hz-20KHz
  S/N Ratio  63dB
  Rated impedance  3 Ohms
  Distortion  ≤10%
  BT  2.1+EDR
  BT pairing name  ZEB-HELIX
  Input  USB 5V
  Playback time  1.5-3hrs
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