Xylem WA400 HIGH WATER ALARM - Manual (Page 9)

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f. To change batteries (DC, FS, BU models only) while installed, slowly
remove the top cap to access the board and batteries. Turn the
switch to the OFF position before changing batteries. Be careful
not to snag or break any wires of the sensors or alarm.
g. To de-activate alarm, turn the power switch to the off position.