A variation on the monome offworld USB power splitter - with USB micro-b jacks instead of mini.
"this little dongle allows you to power a device (i.e. grid) from an external source (i.e. USB charger) while passing the data lines to a host (i.e. module)"
Useful for larger grids or other power hungry devices which can't get enough juice when connected to a computer/raspberry-pi
1 USB-A on one side (Device), 2 USB Micro-B jacks on the other (Power and Data).
Fully assembled w/ acrylic case.