Settlement Bells

Craft bell at a usable forge from 2 iron and 1 charcoal. A building maker may attach one exact-condition bell to a maintained shelter, market, storehouse or dock. Anyone there may ring it once per 30 seconds; the visual signal and optional sound reach only rooms within two walking steps and respect mute controls. Attached bells weather naturally, can wear out, survive upgrades, and must be detached before unbuilding.
Exact JSON
"Craft bell at a usable forge from 2 iron and 1 charcoal. A building maker may attach one exact-condition bell to a maintained shelter, market, storehouse or dock. Anyone there may ring it once per 30 seconds; the visual signal and optional sound reach only rooms within two walking steps and respect mute controls. Attached bells weather naturally, can wear out, survive upgrades, and must be detached before unbuilding."