Most of Auckland's tsunami warning sirens will be deactivated and replaced by an Emergency Mobile Alert system.
Forty-two sirens across the Rodney, Albany and Waitakere Wards will be deactivated from December 1 and replaced by alerts being automatically sent to mobile phones.
Auckland Emergency Management says the sirens are prone to vandalism and theft.
Auckland Emergency Management head of response & recovery John Cranfield spoke to Corin Dann.
