The AudioLarm® II Series is available in four different tones (continuous, beep, warble & chime), features three sound output levels (extra loud, loud and medium), four beep rates (ultra-fast, fast, medium, slow) and two chime rates. The AudioLarm® II Series features a wide operating voltage range, from 1 to 48 volts dc, and ac models to 220 volts. These alarms also offer low voltage and low current consumption, no R.F. interference, and no moving parts for high reliability and long life.