Being out and about and having your cell phone battery die has to be one of the most irritating first-world problems in existence.

What if you could avoid it simply by wearing the right shirt? That’s what UK mobile phone company Orange is striving for.

At last weekend’s Glastonbury music festival in Somerset, England, Orange outfitted several people in its branded T-shirts, claiming they could use sound from the event and convert in into energy that would charge a phone over the course of the weekend.

Breakthrough technology or PR stunt? Watch the video and decide for yourself.

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