4-in-1 filter includes pre-filter layer and a combination of an activated carbon and high efficiency filter for 99 % of 0.1 micron particles or larger on sleep mode including pollen dust smoke and dander. Activated carbon works on common household odors pet odors and volatile organic compounds. AIRTOK 4-In-1 air purifiers use advanced DC Brushless Motor, powerful and energy saving(Rated Power 10W). Air purifier with Fragrance Sponge & Night Light& Low Noise Add your favorite essential oils (Not Included) to the aroma pad (12pcs included in the package) under the cover, the aroma will diffuse throughout the room with the air movement. You can choose whether to turn on or off the night light according to yourself. Air purifiers for bedroom less than 50dB white noise at the highest wind speed, with low speed reduce noise levels to a near 25dB.