The MALLORY SONALERT part SC628A is a versatile audio device that operates on either 6VDC or 6VAC, as well as 28VDC or 28VAC. With a low power consumption of just 16mA, this sound alarm emits a clear and attention-grabbing sound level of 68dBA. The frequency range of this device is between 2400Hz and 3400Hz, making it suitable for various applications that require an audible alert. It can be easily mounted onto a panel using screws, ensuring a secure installation.