Cat owners, take note: The Whisko LitterGuard Pro is essentially an ionizer that helps eliminate odors from your litter box. It plugs into your outlet, and there are plenty of cheaper alternatives on Amazon, but Whisko has marketed specifically to pet owners. 

There’s a mixed bag of reviews on these ionizers across the web, and on Reddit, so try at your own risk. I’ve had a good experience using mine to help mitigate the smell of my cat’s litter in combination with a Oneisall robot litter box. Still, many customers (current or former) note that ionizers using Bipolar Ion technology may produce small amounts of ozone, which can be harmful.