This Air purifier is amazing, has very high performance. The difference in the room is awesome.Has a sleep mode for quiet sleep.You can set the timer as you want.Love the fact you can control from your Alexa or you can Bluetooth it.By far the best purifier I have used.I have bad allergies and it helps tremendously. Very easy to set up 3 stage filtration to break down the Pollutants and Allergens.Makes breathing easier.