Detergency, as you can see
BEHEART White Key™W2 has a built-in gyroscope for collecting real-time brushing data,
Tracking the brushing path, accurately detecting and displaying the blind area of oral cleaning.
Timely remind you to brush the teeth comprehensively without leaving blind area to have healthier gums.
(Note about the feedback icon: If the brushing area is completely cleaned, the icon will light up; if the cleaning time is insufficient or the cleaning area is not fully covered, the icon will not light up.)