The StoneDock automatically starts charging by simply plugging your iPhone or iPod on the connector. When the device is fully charged or unplugged, it will automatically shut off with ZERO idle power to save energy waste and your device battery. With STONEDOCK GreenZERO we could save 47 Mega Tons of CO2 every year for 70 million users* (based on the European CO2 emission for the French travel chargers users, Energy Star compliant.) The exclusive GreenZERO Technology designed by OSUNGO is the most eco-friendly way to charge the devices while totally eliminating the wasting stand-by consumption (ZERO idle power) that other chargers consume when they are left plugged into the AC outlets. You no longer need to worry about unplugging your charger or switching off the power strip to save energy.