Noise-canceling microphone (50dB) With AI activation button Open-ear type Bluetooth 5.3 ◎ ENC noise cancellation + DSP digital processing technology for clear voice transmission ◎ navibook's unique AI noise cancellation technology eliminates ambient noise (sound) and delivers only your voice to the other party ◎ The NB200 has three microphones. All three microphones are equipped with sound pressure sensors. The AI instantly analyzes the audio data collected from the three microphones into "the speaker's own voice" and "everything else (noise/sound)." As a result, only "the speaker's own voice" is delivered to the other party, and "everything else (noise/sound)" is eliminated/cut. ◎ Charging method: USB Type-C ★ Quick charging: Approximately 30 minutes (full charge) / Approximately 5 minutes (2h call/4h music playback) ◎ Playback time: Approximately 12 hours (call) / Approximately 18 hours (music playback) ◎ Battery capacity: 180mAh ◎ Weight: Approximately 35g ◎ Communication method: Bluetooth 5.3 (supports multi-pairing) ◎ Waterproof standard: IPX5 Used about twice. There are no noticeable scratches or stains, but please be aware that this is a used item.