This may be caused by an increase of resistance between the skin and the adhesion surface, which can occur when the adhesion surface is not properly attached to the skin or if the skin is dry. Please check whether or not the pad is properly attached and attach the adhesion surface to the skin if required, or apply low-frequency gel sufficiently to the skin and use.
The degree to which the human body feels low frequency stimulation is determined by the current value.
However, the same current value feels much stronger for people with moist or thin skin.
The left and right side of the human body are generally unequal, so it is very natural to feel that the intensity level on either side is different when the low frequency stimulation is applied.
However, if the difference feels too large, a health check-up is recommended.
A built-in circuit is incorporated to protect the device in the case of an abnormal current flow during use.
If this happens, unplug the power adapter and plug it in again.