The siren on Victoria Tower will be retained for public events
The States has decided to dismantle Guernsey's warning system sirens despite public protest.
About 40 islanders attended a march in February opposing plans and submitted a petition to the States.
The Home Department said it "respected" the protest but the sirens would be dismantled because they were no longer used and maintenance was too expensive.
The siren on Victoria Tower will be retained for public events including Liberation Day.
Home Department minister Geoff Mahy said he respected the protest group's views and had taken the petition to the board.
"The board looked at the situation again and were unanimous that there was no justification for us to ask the States to spend taxpayers' money on something that was not likely to be used," he added.
"We are handing one to the culture and leisure department and we're going to give any decent spare sirens to the museum to keep as mementoes of times past."
The Home Department said if a major emergency occurred there would be different methods to alert people to it, including the use of sirens on blue-light vehicles.