Backup flashlights are usually placed in a corner of the home. They are only used when there is a power outage or when you need to go to the utility room to find something, but they have been left for a long time. If there is no charging, it would be very annoying to find that the battery is out of power when using it. This small, rechargeable flashlight can avoid this embarrassment. Its appearance is nothing special, but it has a built-in thermoelectric generator TEG. As long as the external environment temperature is lower than body temperature, you can use the temperature difference by placing your fingers on it. Comes to power a small flashlight, a must-have item for outdoor adventures.
Crowdfunding address: https://www.kickstarter.com/projects/940015402/lumen-eternal-flashlight-that-doesnt-need-batterie/
