Sound Charge t-shirt tops up mobile devices using sound

Visitors to the UK's best-known music festival are almost guaranteed three things - mud, loud music and a dead mobile device battery. Happily, Orange has increased the number of Chill 'n' Charge tents to help make sure lines of communication stay open and - in what is now becoming as much of a tradition as Glastonbury itself - the company has announced the development of a new green charging technology. Previous projects have included a Power Pump and last year's Orange Power Wellies, and the latest prototype charger is no less impressive. As the name may indicate, the Sound Charge t-shirt turns sound waves into electric charge, allowing the wearer to top up a device battery while thrashing around in the mosh pit.

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