Connect a 9-volt alkaline battery (not included) to the battery terminals and place in the battery compartment in the front panel. The battery allows the user to program the controller without AC power. Watering will not occur without AC power. Since this controller has non-volatile memory, the program clock and calendar will be retained during a power outage even if no battery is installed.
After installing your Pro-C, make sure to remove the battery contact insulator to allow the Pro-C to keep time in the event of a power outage.
WARNING: RISK OF FIRE, EXPLOSION, AND ELECTRIC SHOCK. REPLACE BATTERY WITH CR2032 TYPE ONLY. Use of a different battery has potential for a risk of fire, explosion, and electric shock. See owner’s manual for instructions.