The inside of the surface-mounted device (SMD) piezoelectric sounder is divided into
air chambers by a piezoelectric diaphragm and silicone adhesive. These air chambers are connected to the
outside through the sound-emitting hole and open hole established on the top and sides of the product.
Suction may be applied to the inside of the product depending on the position of the
suction pad. The following failures may then occur.