While the Nikola looks like a regular iPhone case, it does much more than simply house your smartphone in a different enclosure. Instead, it comes with integrated hardware that allows it to harvest RF signals that it then converts to usable energy that goes straight into your smartphone’s battery.
Using a proprietary harvesting technology patented by Ohio State University, the case take RF energy that will otherwise be lost to the ether and converts it to DC power. It feeds that power in small trickles directly to the phone’s battery, allowing you to enjoy extra juice without having to plug in throughout the course of the day. Maybe, you can finally leave that LEGO power bank at home (or maybe not, if you play with it a lot).
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https://www.coolthings.com/nikola-phone-case/
