xMEMs working of unbreakable headphones

Silicon Valley firm xMEMs is working on robust headphones, that would revolutionise the headphone market, BBC reports. The basis of their tech is "piezoelectric effect" - if you bend some materials, they produce an electric current, and if you pass an electric current through them they bend. They're using that bendiness to make small speakers that can match the very best sound produced the traditional way, while also being robust and waterproof. The first headphones with this technology are expected on the market next April.