Green Lion 3 In 1 360° Microphone -21 Hours Working Time -Noise Cancelling -Automatic Pairing -Widely compatible -360° Reception -USB-C/Lightning -Frequency: 2.4Ghz -Frequency Response: 20Hz-20kHz -Sampling Frequency: 48kHz -Transmission Range: Up to 20m -Battery (Charging case): 800mAh -Battery (Receiver): 220mAh -Signal to Noise ratio: ≥75dB -Sensitivity : -38dB ±3dB -Working Duration (Receiver): Up to 7h -Working Duration (with case): Up to 21h -Battery (Transmitter): 140mAh