Here is an interesting concept that is able to save the user a simple way of energy.

Think of it as a power strip of egg timer exists. Even if you're too young to know what can an hourglass, you can always find how to use it. Just turn the right attitude, and it is ringing the bell to be checked. This technology has been almost completely replaced with digital watches. My children have never seen one, I'm sure.

Wound base was developed to power by the device are saved, then turn the time you want to run it. It is ideal for devices that need not always be inserted

The Wind Up base is so simple that even your grandmother can use. I know this may seem like a slam, most seniors, but good to try to program a VCR. She still has not realized that the VCR has been replaced by the DVR. You probably still on egg timers, though.

Sure, it sounds like an easy way to involve your son, right? This seems like an obvious design flaw in another well-intentioned idea of designers and Jieun Dongwon Joo Choi. Perhaps this figure another way, this idea is simply to make this dials in the vicinity of locks, and not as a stopper.