It detects the sound a smoker detector makes when that smoke detector is set off, so you can't use it as a smoke detector that would be out of range of your current smoke detector.
I'd be totally fine with that. I just need to know how to do it.
I don't have Roku at the moment, but am looking to get it. I just want to know if this is possible and how so I can properly set it up. The Roku site doesn't say how to do this.