Add two (2) OTG USB-A ports to your Nor7e device.

Connects on the Nor7e accessories port in the back, fully OTG no extra power required.
For connecting SD Cards, External Storage units, the DMD Walkie Talkie or simply to charge other devices like action cameras and phone.

This is only for attaching 3rd party equipment, this cannot be used to power the Nor7e unit itself.