Did you know indoor air can be 2 to 5x more polluted than outdoor air? Now you can feel better that your baby is breathing cleaner air with the NUK HEPA-TYPE Air Purifier. It removes 99% of airborne particles including allergens, dust mites, pollen, and pet dander to create a healthy nursery and bedroom environment all day long! The NUK Air Purifier has 3 speed settings & a permanent filter that never needs replacing - simply vacuum when the maintenance light turns on every 3-4 months. It also includes an Ionizer that emits negative ions that bind with airborne dust and pollen to form larger particles that are more easily captured by the filter. The NUK Air purifier is perfect for small or medium sized bedrooms or nurseries to ensure cleaner air. The NUK Air Purifier has additional scientifically designed features to help create a healthy nursery environment including: 1) White Noise: The air purifier emits soothing white noise, which is significantly more effective at getting babies to sleep quickly versus silence 2) Amber nightlight: The air purifier includes a soothing amber nightlight which is better for sleep than blue or white nightlights, which depress production of the sleep hormone melatonin.