High Capacity, 8 GB, 16 GB, 32 GB and 64 GB are the most common sizes.
They have 4 plugs in 1. Apple, Android, Micro USB and USB!
They are designed to quickly offload data from your phone to this handy USB.
otg-flash-drive custom high speed otg drives with your logo
Why do you want them?
Ask any millenial and one of their complaints is that their data (pics, videos etc) i causing their smartphones to slow down and “data-out”. Basically causing them to no longer be able to add more data.
Also, to send or “offload” this data to another device via wifi causes serious data charges to be incurred.