Listening to Nature Sounds6 Sets of audio, 31 non-looping soothing sleep sounds, fan sound, white noise, natural scene sounds, hypnotic sounds, ocean scene sounds, bird, seagulls, ocean waves, rain, running water, thunderstorm, drops, summer night and so on. Farewell to InsomniaWhite noise machine adults equipped high power amplifier, audio up to 120DB, can effectively isolate the environmental noise and perfect for baby sleeping, a variety of nature's soothing sounds to give peace of mind, this noise machine is perfect for stressed and anxious adults. Powerful Features Design30, 60min auto-off or infinite loop playing & memory function, audio size adjustment design, a total of 36 levels of adjustment, audio no break point design, only for you can better experience, not be disturbed, 4.54.52.4 inch portable sound machine. Quality Assurance & Security GuaranteePowered by AC adapter (not included) or USB plug (Includes USB cable), just plug in the Cefoust white noise machine, you do not have to worry about quality and safety issues, this sleep machine through CE, FCC, RoHS certification.