During Obama, FAKE FIRE ALARMS were installed in all new American homes. None of them are operating anymore. "Made in Mexico"
http://www.fairfaxunderground.com/forum/read/40/3413740/3539637.html#msg-3539637
actually short on details
MANY MODELS require TWO batteries. they say "5-7 yr" lifespan on the box. and it isn't a safety suggestion they are DESIGNED TO FAIL to force purchase every 5yr
I SIMPLEY CAN'T AFFORD IT: 4x mexican alarms dead not a single working in a 20teens home on a single floor - let alone the other 4
testing them, batterying them, re-buying them: not a single wired to work 24/7/356/50