Free shipping. The unexpected 4× faster humidification speed lasts up to 60 hours, and the covering is up to 505 ft². You can also use the APP to customize the humidity so that it adjusts automatically without worry. Lying in bed, using the APP or Alexa to control settings, the humidifier will raise RH 12% in 30mins. Enjoy the soft night lights, and the Sleep Mode will give you an optimal sleep-humidifying environment.