The all new APak® alarm is more compact and easier to install. It is CSA approved in a NEMA 1 enclosure. Battery life is over 1 year from 2 AA batteries. Alarm may be used as AC only, DC only, or AC/DC applications. The APak® alarm system sounds a horn when a potentially threatening liquid level condition occurs. The horn can be silenced, but the alarm light remains on until the condition is remedied. A green POWER ON light indicates 120 V primary power to the alarm. A low battery chirp feature indicates when the battery should be replaced. A red ALARM light indicates a high-level condition.