Ultra Series alarms are available in six different tones (continuous, beep, warble, siren, whoop and staccato). These alarms are also available as dual function alarms: continuous + beep and continuous + warble. Ultra Series alarms feature operating voltage ranges of 5-15 Vdc, 6-28 Vdc and 20-30 Vac/dc, and offer low 2KHz center frequency as well as low current consumption.