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If Base Station battery (optional) is low, it will beep every few minutes. Replace with 9-Volt battery (not provided). For peak performance inspect batteries annually and replace as needed. Base Station Switches: Switch #1: Switch #2: Programming Additional PIR Motion Sensors: The Base Station can learn the code of up to 3 additional PIR Motion Sensors, responding with unique buzzes. To program additional PIR Motion Sensors see Step 6. To order additional PIR Motion Sensors call 1-800-528-9131.