i have a used roku for my tv, its about a month old, can i reuse the divice or do i need to buy a new one
A Roku device can be used with just about any TV that has an HDMI input. It doesn't link with any particular TV or anything. (Well, there is the possibility of the remote controlling the TV power and volume, but that's easy to change, if you have one of those model Roku devices.)
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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If you are asking if a used Roku device that you have acquired can be installed to your TV, the answer is yes, as long as the TV has an HDMI port you can use.
Did you receive the remote for the device? You won't be able to set it up initially without a compatible remote. If you need a remote, post the Roku model and someone will be able to guide you as to which remote you need.