Any of the voice remotes would work with the TV, but they have to be paired and you may need a working remote to go through the process (or factory reset the TV). You can get the Roku TV remote from Roku for about 10 bucks. It's similar to the TV's original remote. Another alternative is to get a universal remote that supports Roku TVs.
Roku TV Remote | Replacement Remote For Roku TV | Roku
For voice remotes (also available in some stores):
https://www.roku.com/products/accessories
Note that the "simple" remote for Roku players won't work with TVs. "Simple" implies no voice feature and it has to be pointed at the TV unlike the voice remotes. The only "simple" remote that works with TVs is the one linked to above.
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