Leeo is for people who don&#x27;t see a need to replace their existing smoke&#x2F;CO detectors and just want some peace of mind when they&#x27;re away, but the pets aren&#x27;t. I bought one used for $70 because I think it definitely has a place in a &quot;smart&quot;&#x2F;monitored home. Just like dropcam. Heck, dropcam should be able to listen for your smoke detector. Might justify some of its cost.