ECSEM? LED Light Up Luminescent Visible Current Flow Smart Charger and Sync Cable for Apple iPhone 4S iPad iPod Touch - White Cable/Green Light Electroluminescent (EL) technology to see current flow as charging; Visible current flowing speed indicates the iPhone battery level: 1% - 65% FAST; 65% - 99% SLOW; 100% OFF; Shuts off power from the source when your device is fully charged; Reducing the consumption from charging and data sync; Hotsysnc & Charging all in one. Connect your cellphone with your PC/Laptop by USB port.