Wireless speaker functionality: Stream your favorite sleep soundtrack, podcast, or music from your smartphone directly to the Duet speaker 30 non-looping sounds plus sleep timer: Robust sound options include 2 Dohm signature sounds, fan sounds, white noise, brown noise, pink noise, 9 nature sounds, relaxation tracks, and calming classically-inspired lullabies. Set the sleep timer to 45 minutes, 90 minutes, or 8 hours Unbeatable quality & guarantee: For over 50 years, Yogasleep has been the gold standard for white noise machines. Backed by a one-year limited warranty and exceptional Yogasleep customer experience, we stand behind each product and offer you a 30-day return policy. Warm night light: Soft amber night light with gradient brightness perfect for infant nighttime feedings and growing with your child. Simply Hold down the button to adjust night light brightness Modern look: Streamlined unit combines sound machine, night light, and wireless speaker in one device; keeps bedside area tidy. No batteries required, powered by USB cord. (USB power adapter wall plug not included.) To keep this product on and operating, the unit must be plugged in at all times.