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The Velleman TV4 Piezo Electric Ceramic Buzzer offers a simple structure where the Ceramic Piezo-element is attached to a vibration plate that expands and contracts diametrically when any alternating voltage is applied to supply a sound of 75dB. The technology bends the vibration plate thus generating sound which can be subdivided into self & external oscillation methods. This simple design circuit allows the creation of sound pressure using a fixed frequency producing sound through the oscillator.