Hydro Powered Calculator

Check out this eco-friendly calculator with a water powered battery!

The water-powered batteries consists of two electrodes made of special alloys, which, when immersed in water, produce electricity through a chemical reaction.  Simply refill the battery as the water evaporates, typically every two to three months.  Not only is this eco-friendly, it’s providing free energy.  Well, not enough free energy to power your computer or drive you home, but it’s still impressive! 

$10.99 at Perpetual Kid. Click image to buy.

(image from perpetualkid.com)