Brand New in Box! Purchased December 2021 - 4 hours continuous running time, 8 hours intermittent - auto shut off - room coverage 300 square feet - USB compatible - Heat free Scent every nook of your home with this petite, USB-compatible diffuser. A stylish, embossed lid and optional LED light feature make the Aroma Nook a standout that fits in with any décor. Ultrasonic diffusers refresh and renew the air in your space by releasing negative ions and personalized, natural scent. In other words, they mimic the experience of being in nature: imagine the revitalizing feeling of standing next to a waterfall or crashing surf.