AT&T today trumpeted its green credentials through the ZERO Charger. The Superior Communications-made device powers most low-power USB devices, including the iPhone, and is purportedly the world's first charger to avoid "vampire" power draw. When a device is full, the ZERO automatically stops charging and therefore avoids a trickle of energy when a device is left plugged in. The interchangeable "block" design also reduces the obsolescence of the charger once owners replace their devices.
