(I just tried posting a similar message, but it looks like it got tangled up, so I'm trying again.)
The other night within about 5 minutes four smoke alarms, First Alert, went off in four rooms--all close to one another. It turned out the batteries were low. Last replaced in 2001/2002. I didn't know they were somehow connected. Is that really what is done now days? The house if 8 years old.
Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA) (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time) Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet