4-Pack Pest Repeller Ultrasonic Dalei A humidifier, an air purifier, a nebulizer, and a nightlight in one. Easy and safe to use. (Please see description #2 and #3 below.) Sleek and elegant design. (Please see description #4 below.) Extremely efficient, durable, dependable and saves energy. (Please eee description #5 below) Bringing tranquility and serenity to your mind by turning any room into your own sanctuary.