Beetro Air Curtain 606DS (MS-A66 DS) SensorBeetro Air Curtain 606DS (MS A66 DS) Sensor Introducing the Beetro Air Curtain 606DS (MS A66 DS) Sensor, a reliable way to keep indoor spaces cozy. It's a big 6 foot curtain that blows air to block out outside stuff like cold drafts or insects. If the power goes out, it can start up again by itself, so you don't have to worry about it. It's got a really good fan and motor that save energy, so it won't cost a lot to run. You can control it either with