An interesting household gadget has arrived in the Dupont Self-Charging Smoke Alarm.  We will be the first to admit it, changing the batteries in a smoke alarm can be a bit of a hassle.  With this new smoke alarm, all you have to do is screw it into a light socket.  The unit charges when the light is turned on, and is capable of going 30 days without a charge. Oh, andjJust in case you forget to charge it, an audible alarm will alert you when the unit is low on power. If that happens, turn on your light for a while, and you are good to go. The other great feature of this smoke alarm is that it can be tested (or silenced) by merely flipping the light switch.  No more fumbling around trying to replace a battery, or finding the test button.

Read More | Dupont via OhGizmo