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.
If you apply strong pressure to the top of the product, the lid may become deformed
and it may come off. If the lid comes off, the air chambers may no longer be able to form. The sound
pressure may then drop.