Electric shaver: The electric shaver is composed of a stainless steel mesh cover, an inner blade, a micro electric motor, and a housing. The mesh cover is a fixed outer blade with many holes on it, into which the beard can extend. A micro electric motor is driven by electrical energy, driving the inner blade to move, and using the cutting principle, the beard that extends into the hole is cut off. Electric shavers can be divided into two types based on the movement characteristics of the inner blade: rotary and reciprocating. The power sources used include dry batteries, batteries, and AC charging. The electric shaver uses an electric motor to drive the moving blade to move relative to the fixed blade, cutting the beard or hair that enters the mesh. The effectiveness of shaving is mainly determined by the accuracy of the fit between the fixed blade and the moving blade. It requires that the spherical curvature of the fixed and moving blades should match appropriately, and there should be a pressure distance of about 1mm and a certain shear angle between the two blades. The pressure distance is too small, the shaving is not sharp, and there is a feeling of plucking; If the pressure distance is too large, it will consume a lot of power and cause severe wear on the blade, while also emitting a sharp abnormal sound