Sometimes the simplest ideas are the best. Ideas that don't rely on complex circuitry. No USB this or LED that. What they do have is inspired thinking behind them - and this gizmo is no exception to this rule of brilliance. If you're down on power and it's late at night, you need AA friend. No, not the chaps in the yellow reflective jackets. We're talking batteries of the AA sort. Because a mobile that's about to let you (and the whole world) know it's just run out of power is the scourge of the modern age, now you can top it up without recourse to an in-car cigarette lighter or clunky wind-up device. It's a revolution. It's called battery power.

And it's a wonder no-one's thought of it before. Because the more the mobile telephone becomes a constant feature of modern life, the more one relies on their constant availability - and constant power. When you're about to run out of power, just plug in to the battery-powered charger - it connects with virtually all types of mobile - for an extra 2 spiffing hours of stand-by time or 30-50 minutes of talk time, depending on your phone. The unit comes complete with a chain for attaching to your keyring, so not only is it ultra-useful, it's ultra-portable too.