Adaptive Sound technology Listens and responds to your environment. 10 Unique Digital Sounds Helps to relax and fall asleep. White Noise tones Makes you fall asleep and keep distractions at bay. Upward facing speakers For full room sound. Sound Richness control Keeps you in the deepest sleep. Audio line out and in For listening via headphones or connecting your device. Simple adjustable tone control functions Lets you create a personalized sound. Built-in timer Lets you set session length for 30 60 90 or 120 minutes. Light-touch buttons For ease-of-use.