Soothing Sleep Sounds: With six calming sounds, including rain, brook, ocean, soft thunder, white noise, summer night; this rain sound machine for sleeping helps babies and adults fall asleep fasterAuto-Off Timer Options: Set the noise maker for sleep to play continuously or use the auto-off timer for 30, 60, or 120 minutes; helps save battery life while delivering a full nights sleepBlock Background Noise: White noise sound machine masks distractions; ideal for improved sleep, focus, and comfort while working, traveling, or relaxing; great for yoga and meditation sessionsMultiple Power Sources: This white noise machine operates with an included AC adapter or three AA batteries (not included); its portability makes it the perfect companion for travel or use in any roomCompact and Portable Design: Lightweight and sleek, this sound machine for sleep is ideal for adults and children; easily fit it into your suitcase for travel; measures 4 x 4 x 3 inches