This is the sound machine that promotes sleep with soothing white noise or nature sounds, while eliminating 99% of airborne germs, allergens, and other harmful particles. An advanced two-stage air filtration system contains an H13 HEPA filter that captures pet hair, dander, smoke, odors, and large dust particles, while its two UV-C LEDs generate 260-280nm light that kills 99% of airborne bacteria and other microbes. Sound therapy with adjustable volume drowns out disruptive background noises with white, brown, or pink noise, rain, or ocean waves. A sleep timer provides settings up to 90 minutes. A night light can be turned on for a soft glow and the diffuser sponge enables aromatherapy with essential oils. Plugs into USB with included cord. 5" H x 3 1/4" diameter. (8 oz.)