Pure Enrichment Large Ultrasonic Cool Mist Humidifier The cool thing about this Pure Enrichment Large Ultrasonic Cool Mist Humidifier ($40) is that it uses ultrasonic cool mist technology to safely moisturise the air for up to 16 continuous hours — perfect for a nursery or for when you're sick. Image Source: target.com Pure Enrichment Large Ultrasonic Cool Mist Humidifier $40 from target.com Buy Now