Telecom giant Orange has unveiled a prototype of a t-shirt, which uses noise-responsive technology to charge the phone. Louder the music, quicker the phone gets charged.

The futuristic garment uses an A4-size piece of piezoelectric film in a T-shirt to absorb pressure from sound waves. It converts these into an electrical charge, which it then transfers from its battery into a lead that fits most phones.

Users just need to plug their phones into the T-shirt for a quick top-up charge whenever they need it.

Festival-goers can now head-bang all night long at concerts without worrying about their mobile batteries getting exhausted.