Charging a device means leaving it unattended for an hour or so, and more often than not it'll remain plugged in even when the battery's good to go. That's power wasted, and a slight increase on your carbon footprint. Not the VogDUO. It's the only charger of its kind that has an auto-shutdown feature.
Just plug in your portable gadget in any of its four ports, and then set the timer, from one to four hours. Once the four glowing LEDs all blink out, the VogDUO shuts down, ensuring that you can leave your mobile device alone to charge, and not have to worry about sullying up the planet.