NO Bluetooth and YES it's good.
I bought a 50 Inch Westinghouse 4K on Black Friday from another store and then purchased this 58 inch at Best Buy. The first I bought for my mother... Prior to this all the TVs we have are 32-inch 720P resolution... I also just got rid of the last of my "box" analog TV's, so the jump to 4K is amazing and beautiful. I've been watching all the theater on PBS and it feels like I bought tickets! What's not to love! YES the Westinghouse is good. I never thought I'd have a TV so large so for a long time I convinced myself that 32 inch was big enough. I used to visit that room in the corner in the back of Best Buy and see the high-resolution TVs for thousands of dollars. This size was out of reach for me just a few years ago. The other thing too. I know that some are out there that are "better" but for the most part, most of what I watch is not 4K 2160 resolution.
When I bought the black Friday special 50" one of my friends also purchased one the same night. He loves it as much as I do. When I purchased the 58inch another one of my friends also purchased one of them. He loves it so much that now he wants a second 58". YEAH. These are awesome TVs!!! Especially for the price!
So I bought the second, slightly larger when this new 58" size came out and under $300. For me and any family or friends to watch when they stop by. I keep it in the living room as I recently removed TV from my bedroom, keeping that room "electronic-free" for sanity and peace. Same brand, just slightly larger. This TV does not have Bluetooth. And the USB port only allows you to plug in a flash drive so that you can rewind OVER THE AIR TV. Other than Roku we use Mohu Leaf antennas and never have had cable.
I tried a few things to utilize Bluetooth but none of them worked so far. I also was hoping that if I used a splitter, I could plug in BOTH the Flash drive to rewind and the Bluetooth dongle but that made it so that the flash drive would not work at all.
This leads me to believe that you probably won't be able to plug in a dongle to make headphones work either.
Perhaps someone with more extensive knowledge might know what kind of Bluetooth attachment - if any - might help you expand that capability.
I was hoping that I could use a USB BlueTooth dongle to get my Bluetooth speakers I already own to work but, no, it's not happening. In the setup feature, it appears that you would need to specifically buy a ROKU soundbar. The setup didn't read the dongle. I'm not so interested in buying another device and the sound from the TV is satisfactory.
For now, it seems that the only thing the USB port will do is allow you to rewind Over-The-Air TV. And that's actually a good thing even though I would have loved to expand my sound.