Energizer 3-Port Cup Holder Charger and USB Ports
Every family needs one of these things. The Energizer EN180 3-port car charger has won multiple awards for the design, and being pretty amazing.
This little thing fits nicely in your cup holder, has a long cable for power, and gives you three USB charging ports for the backseat, coin holders, and a spot to set your phone. It's perfect for the kids. The long cigarette lighter plug retracts into the base when it's not in use, or comes out and is long enough to reach all the way to the front of the car.
Plug it in, direct it to the back, and throw it in a cup holder for the kids. Now, they can charge up to 5 devices at a time and won't have to bother the driver to switch or unplug different things on the go.