I have a Sunbrite TV in my screened-in section. I wanted to use Roku Ultra, because that Outdoor tv doesn’t have smart features. Roku says it has Bluetooth, so can I connect Roku Ultra with my wireless Bluetooth speakers?
Sorry, no. You can only connect a Bluetooth device to your Ultra to cast from that device to the Ultra.
"Cast your favorite music, podcasts, and more to your TV with a connected Bluetooth device."
https://www.roku.com/products/roku-ultra