The MALLORY SONALERT part PK-20N38WQ is an audio device with a voltage range of 3VDC to 28VDC. It has a current consumption of 12mA and produces a loud sound output of 85dBA. The frequency range of this device is between 3300Hz to 4300Hz, offering a clear and distinct tone. It is designed with wire leads for easy installation and features a flange mount for added stability.