Hand Crank Smartphone Charger
The hand crank smartphone charger is actually a charger device that have plenty of power source options. In this one device, you can insert AAA rechargeable batteries or just a simple AAA batteries as the first source of power.
Next, while batteries are not available, it can grasp the solar power to make it work in charging your smartphone. Last but not least, when batteries and solar power are not available, you can just spin the hand crank to produce power that will be enough to charge your smartphone.