The Diversitech" UA-1 is a universal low-voltage alarm that can indicate possible system trouble. Suitable for use with the Wet Switch, SOS, Condensate Cop, CP-22 (all types) and all float switches on 24VAC control circuits. If an alarm condition exists, the homeowner can turn the alarm off with a silence button until service is obtained, however a red trouble LED will remain lit. Actuates at greater than 18V to prevent any false alarms due to low voltage. Also includes instructions for wiring normally open switch systems (for the CP-22 or other condensate pumps).