You can get the simple remote - https://www.roku.com/products/accessories/roku-simple-remote .
Any universal remote that supports Roku will also work. To ensure your current remote isn't working you can point it at a digital camera like the one in your phone. You should see a flash of light on the camera screen when you press a button. If you don't see a flash, the remote is dead. If you do, then it's possible that the remote isn't the problem.
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