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dolores posted an update Thursday, Nov 20, 2014, 10:21pm EST, 10 years, 10 months ago
When I lived in Lancaster CA the smoke alarms were hard wired and also had batteries. If one went out they all beeped. There was a high ceiling in the living room and we couldn't reach that one. After a bad episode I decided to hire an electrician to change all the batteries every March.
My current house has 2 smoke alarms. They are mounted high on the wall where I can reach them. I know they are supposed to be on the ceiling but they do work where they are.