Batteryless Smoke Alarm
by Justin Thomas, Virginia on 11.26.05
No batteries required for this smoke alarm. Instead, it connects directly into ceiling mounted light sockets, automatically recharging whenever the light is turned on. Not bad — it involves less maintenance, and saves batteries from the landfill. The price is $39.95. :: First Street
ive had one of these for about a year now, theyre really good, just pretty much install and ingore, no need to check batteries, just make sure that its installed in a light that is on everyday, otherwise you tend to get low battery warnings (beeps) during the summer. also if u hit the wrong switch and turn the light off then turn it on within 20 seconds(ish) it sets off the alarm (test) for 20 seconds, then does a fairly loud beep once a minute for 5 mins (to show its inactive), otherwise an excellent purchase.
Shouldn't that image show a compact fluorescent light globe ;-)