Volt-Star EcoCharger with Mini and Micro USB Adapters - Charger - Retail Packaging - White Completely shuts off to ZERO power when it senses your cell phone is charged for the maximum savings and benefits possible unlike lesser "Eco" branded chargers that only reduce their power draw during idle Saves energy when charging due to high efficiency exceeding Energy Star II standards Increases the life span of your cell phone's expensive-to-replace battery due to the ZERO shut-off feature Protects your cell phone and charger with unique heavy duty surge protection Universal -Charges all devices with Mini USB or Micro USB charging ports