Well, its a good thing for a change. The new type doesn't cost more, if you concider that a old type needed at least 10 batteries (20 if your advice is followed) during the 10 years. And that was the stupid, expensive 9V block batteries. So using the new 10 year alarms is probably even cheaper.
Well, its a good thing for a change. The new type doesn't cost more, if you concider that a old type needed at least 10 batteries (20 if your advice is followed) during the 10 years. And that was the stupid, expensive 9V block batteries. So using the new 10 year alarms is probably even cheaper.
Maybe someone will run a cost/benefit analysis. Probably with a government grant!