U.K. signalling manufacturer E2S Warning Signals has designed and developed a bespoke siren system to alert people nearby when an RNLI lifeboat is launching. The Royal National Lifeboat Institution (RNLI) is the charity that saves lives at sea. It has 236 lifeboat stations around the coasts of the U.K. and Ireland. Its lifeboats are crewed by specially trained volunteers, who carry pagers. When the pager goes off, alerting them to an emergency at sea, they drop everything and rush to the station to launch the lifeboat.