In fact, there is not much difference, except that the x4 battery is more durable than the x3 battery and has a longer battery life.
Beici is a domestic brand of personal care appliances with more than 70 patented technologies and guaranteed quality.
Beici X3 smart shaver, smart screen display, portable operation. 3D floating cutter head, more efficient veneer, double ring veneer blade, self-sharpening blade, 1 hour fast charge, 90 days long battery life, Type-C charging.