Because it’s a silent ☠️ and NOT regulated or required in most places like you might think! This compact one is easy to travel with! Easily plugs into any outlet. Ideally put near bed or bedrooms. I actually plug it in our bedroom hallway at home as a back up! Literally helps me sleep at night! travelhack travelmusthave amazon LTKmomlife LTKKids LTKTravel