I reset the Roku and lost the remote. How do I know which remote will work with my device ? Where do I look for a serial number or device number?
If you log in to your account at roku.com, you should see a list of all your linked devices.
What if it’s not there???
My first guess would be that you're not logging into the same account that the roku device is connected to. ??
For example, if you created a Roku account today in order to ask this question, and your Roku has already up and running for some time, then it would not be connected to today's new account but an account created in the past. Does that sound plausible?
Also, on occasion, we've seen posts about Rokus that were connected to the roku accounts of parents, children, roommates, a son's friend etc. Any of these might make it hard to find out online. (And probably should be changed in the long run to maintain your sanity.)
However, for just getting the model number, they are usually printed or molded somewhere on the device too, but in tiny lettering. Typically it is molded into the case so you have to read tiny black-on-black text.
The short answer is that either of the Voice remotes will work with any recent Roku device - TV, stick, or stand-alone player. You have to go back pretty far to find a device that they won't work with. The simple remote only works with stand-alone players (no sticks or TVs). And to be clear, a stick plugs directly into the TV without the need for an HDMI cable.
https://www.roku.com/products/accessories
If you're trying to go the used or 3rd party route, we'd need the model number of your Roku device. Universal or 3rd party remotes won't work with sticks.