The MALLORY SONALERT part PK-27H25PQ is an audio indicator piezo designed for applications requiring a high level of sound output. Operating at 3VDC, this device can produce an impressive 100dBA sound level at frequencies ranging from 2000Hz to 3000Hz. With a low current draw of 18mA at 12VDC, this through-hole pin component is perfect for bulk installations where a loud and clear audio signal is needed.