Featuring upward-facing speakers for full-room, high-definition sound, SOUND+SLEEP delivers a rich audio experience and automatically adjusts to minimize the effect of background noises and other distractions. Naturally Recorded, Non-Looping compositions SOUND+SLEEP offers 10 distinct sound profiles that are scientifically engineered to promote relaxation, deeper sleep, and a sense of renewal. This machine dynamically mixes lengthy, naturally recorded, high-definition sounds eliminating repetition. The length of the recordings is important, but that is only part of it. SOUND+SLEEP "composes" the SoundStories on the fly out of a library of high-definition sounds, so that the composition you listen to does not repeat. Patented Adaptive Sound™ Listens and Reacts to the Environment SOUND+SLEEP is the only machine that has Adaptive Sound technology, automatically adjusting to detected background noise for uninterrupted peace and relaxation. This system continuously and automatically "listens" for ambient noise that can disrupt your calm state. Adaptive Sound technology responds to intrusive noises by remixing sound profiles and adjusting the volume to mask the noise without becoming disruptive itself. Compact Design with Customizable Features SOUND+SLEEP has a compact, sleek design that fits on a bedside chair or table. Operation is easy, day or night, thanks to display lights that can be turned on or off and a four-level sleep timer for gradual turn-off in 30, 60, 90, or 120-minute increments. You can play the unit all night or use the timer. The all-night continuous play option lets you keep the soothing sounds going until you're ready to get up. Three richness settings control a broad range of additional sounds for optimal sleep conditions.