Xylem WA400 HIGH WATER ALARM - Manual (Page 11)

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c. WA400 (DC, FL models only) has the ability to connect an external DC
power supply if needed. If a DC source, other than the batteries, needs
to be connected, these terminals can be used.
[+12 IN and GND]
Note: AC, AL and BU models use this terminal as the power input from the
AC-to-DC converter.