Buzzer are electronic components that are widely used in circuits to sound an alarm when the value of the current raises above the pre-set values. These are fabricated by using best grade semiconductor materials which results in efficient and longer service. They are available in many different types as per the power ratings. Buzzer can be used in various other devices such as communication equipments, automobile electronics, and various electronic portable tools such as millimetres. They are provided with a ceramic and metal plate that are placed together with the help of adhesives and when the current passes through the system the plates shrink and extebds diametrically to generate sound.