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.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X