Story: Nothing like having an almost heart attack about 330 am this morning. Those little things…… sent everyone running out of bedrooms trying to figure out what was going on!!! Yes, all of them were going off! Nothing so back to bed only to have it go off again at 6 ish and 7 ish so we pulled it off to see what’s going on. (Before you suggest batteries; we change every time we have the time change). After closer inspection on the last round, we solved the issue. CHECK YOUR EXPIRATION DATE!! Ours expired in 2009/2010!!! Yikes! Time to replace them! So check on yours!!