Get up to 2 weeks of back-up battery power with the 6 "D" cell battery holder. This plugs directly into the 9V back-up battery connection on the back of any Control Products FreezeAlarm and the Control Products Wireless WaterAlarm. Even if the unit is calling out every 15 minutes, you'll get almost 2 weeks of battery power from this handy back-up battery device. This device REPLACES the use of a 9-volt battery. The carriage requires 6 "D" cell batteries instead of a single 9-volt.
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