Advanced Acoustic Technology Corp. (AATC) Piezo Buzzers offer a 1mA to 75mA current range, 65dBA to 105dBA sound pressure range, and up to 14,000Hz frequency rating. Piezo buzzers include a piezo plate attached within its plastic housing. When given the input alternating Vpp signal, the piezo plate will vibrate up and down to produce sound. These buzzers are voltage driven and their sound output level (SPL) increases positively with voltage. AATC Piezo Buzzers are robust and resistant to shock, making them ideal for harsh environments.