Overview Up to 103 dB 2 feet Floyd Bells AudioLarm? II Series, first sold in 1982 and the subject of continuous improvement and innovation, is a solid-state, environmentally secure piezoelectric alarm that has become the most widely used industrial alarm in the world. The AudioLarm? II Series features a wide operating voltage range, from 1 to 48 VDC, and 5 to 220 VAC. These alarms also offer low voltage and low current consumption, no R.F. interference, and no moving parts for high reliability and long life like all other Floyd Bell alarms. Available mounting configurations include panel mount through a standard 11- 8" round hole, as well as PC board mount. UL, and NEMA 4X on 07 and V09 bodies with gasket. Our shutter-type manual volume control provides variable attenuation of up to 20 dB. 100 made in the U.S.A. AudioLarm? II Series alarms are UL recognized components.