Hand-Crank Light

The sophisticated modren electrical grid gives us acces to power almost everywhere and any time. It is hard to image life without electricity even for a single day.

There might be some situations like storms, floods, war, or disasters where t there will be server interrepution in power supply. Small Electrical Generator are very helpful for someone in case of emergency situations.

It can also tech kid to learn to generate the power, what is more, it may be helpful for the poor Children to learn at night!

Recently, I buy one Hand Crank Flashlight from IKEA. It is 29.9 RMB (about $4).Rotating the crank 30 times gives 90 seconds of light, according to the description.

I am courious that how long have been in the market? When I search in the Amazon.com(2017-04-01), it has been selled 5 years ago! Price from IKEA.com is $5.99. The price in the Amazon.com is 14.99$! Too too expensive.

If you find this on the ebay, it is more expensiver!

Finally, I think we can learn to know how to trnasfer the energy conversion in the world.