In the U.S., 12 percent of the nation's annual electricity consumption is from electricity that flows through internal and external power adapters, which is nearly 470 billion kWh per year.
The Dexim Visible Green Smart Charger and its automatic shut-off feature helps you reduce unnecessary standby power when your device is not in use up to 85% with their integrated green technology. Simply plug the charger into a wall socket to save power without unplugging your devices.

iPhone battery level Visible current flowing speed 1% - 65% Fast 65% - 99% Slower 100% Off

You can see how fast your device is charging and how much energy you are saving with EL lights flowing through the cord. The light flowing through the cord at a fast pace means your battery charging level is at up to 65 percent. After 65 percent the light will flow at a slower speed, and once fully charged the light will shut off.
[Source : Dexim]