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Audio recorder works fine but you need the corresponding audio recorder installed on your phone (not the smartBand Talk app).
With this, your watch can record an hour or more of audio - all recorded and saved on the phone.
When you tap record on the audio recorder icon on the talk band, the audio recorder app on the phone automatically opens and starts recording whatever you say into the band.
You can use audio recorder separately on the phone - it really is quite a good app, recording wav in stereo.