Summer concertgoers are familiar with this dilemma: As you’re sprinting across a field to catch the next act, you look down at your phone and see you’re running low on juice. Do you keep charging ahead and risk being unreachable post-Kanye, or do you stop at one of the rare phone-charging stations and risk missing part of the show? It’s a 21st century conundrum. But thanks to a new wearable smartphone charger currently being trialed at Glastonbury Festival, it might soon be a choice you don’t have to make.

The Orange Sound Charge, designed with help from green energy experts GotWind, uses an A4-size piece of piezoelectric film in a T-shirt to absorb pressure from sound waves, reveals UKs Metro magazine. It converts these into an electrical charge, which it then transfers from its battery into a lead said to fit most handsets. Testing this new gadget at a music festival is crucial, as its charging-power is based on levels of sound.

Orange is testing the Sound Charge shirts at Glasto as we speak, seeing which bands are loud enough to fully-charge a smartphone. Check out the lineup here and make your own guesses.

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