64 unique high-quality digital sound profiles help promote relaxation and deeper sleep Adaptive Sound technology listens and adjusts levels automatically to suit the environment Sleep timer with 30, 60, 90, and 120-minute settings and gentle off function Display lights can be turned on or off for easy nighttime operation Upward-firing speaker helps fill your room with sound Line-out lets you connect external speaker systems or listen privately through headphones Line-in allows you to connect other audio devices to enjoy music through the built-in speaker Two USB ports can charge your various compatible devices, including your smartphone