The i-Memory AI720 includes a Lightning connector at one end and a USB 3.1 connector at the other end. It comes in 32/64/128 GB capacities and can easily handle UHD 4K video playback thanks to the 90 MB/s transfer speeds. The OTG functionality allows users to save videos and pictures directly on the stick, in order to save up space on their devices.
https://www.notebookcheck.net/ADATA-announces-i-Memory-AI720-USB-drive-storage-expansion-for-iOS-devices.269560.0.html