Notification Equipment Synchronization: To prevent confusion during an unexpected emergency, NFPA 72 stipulates that notification appliances in the exact same location should be synchronized to make a constant and intelligible notify signal. The program also includes a developed-in lithium rechargeable battery to make certain steady operation even during ability outages. https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/