Specifications Model number N8 Brand recordio Origin CN (Origin) Certification THERE IS BT transmission distance ≥ 5m Working voltage 3.3v~4.2v Charging current 500mA Max Package Color Box Frequency range 20hz~20khz ± 3dB Signal to noise ratio ≥ 95dB Charging voltage 5V±5% Distortion ≤ 0.3% (1kHz)