What size micro SD card is supported by Roku Ultra?
I'm trying to find that out myself.
Thanks for the inquiry.
For best results, we recommend a Class 2 or greater micro SD card with a minimum of 2GB storage. You can see what kind of micro SD card we sell on our Products page here: Player Accessories
For more information about increase your Roku device memory, visit our Support page here: How do I increase memory with a micro SD card?