Notification Appliance Synchronization: To forestall confusion in the course of an emergency, NFPA 72 stipulates that notification appliances in the same spot should be synchronized to make a constant and intelligible notify sign. Most important highlights Heat PROMPT: The batteries are items. Should the batteries are useless,pls obtain it by https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/