Depending on the maker's Guidance, you'll then be advised to utilize both a duration of bell wire / twin cable to serve as an interlink cable, or 3-core and earth (which is generally adopted in more recent installations). They run on batteries, enabling the components from the method to communicate https://wirelessfirealarms35566.dailyhitblog.com/40758859/helping-the-others-realize-the-advantages-of-wireless-fire-alarm-equipment