The Narwal Flow 2 is 8 dB quieter than the Roborock Qrevo S.

The Narwal Flow 2 runs at 67 decibels compared to the Roborock Qrevo S at 75 dB. That 8-decibel difference is noticeable in real life — the Flow 2 is a better fit if you work from home and don’t want a vacuum competing with your calls.