Toller dice ...

A great 4-way cube with 2 x USB connection .Very useful on bus trips camping camper where sometimes only
an outlet there.
In addition, you have no more trouble DAS these phones in to charge the two USB ports are very beneficial.
If that's not enough you can also connect two three dice so you have even more options.
The cube is also available with cable, one should lie down and so you are well prepared for the real thing.