This is the 'Universal Charger', which O2 will be selling in its high street shops. It kills two birds with one stone - firstly the annoyance of trying to find the right charger on some dodgy market stall if you happen to lose yours, and secondly, the annoyance of not being able to charge your phone in someone else's house. O2's also touting the energy-efficient nature of the device. It consumes 70 percent less power than a standard mobile phone charger, and meets the strict energy efficient guidelines of the US Energy Star rating system. If every single phone in use in the UK was charged with one of these, it would save the country nearly £31.4 million, and cut the carbon emissions of the equivalent of 36,000 cars.