Multiple Sound Choices to create a most realistic and natural environment: white noise， brown noise， rain， bird， brook， thunder， typhoon， ocean， and two lullabies

Adjustable Sleep Timer: the white noise machine can be played continuously non-stop or with auto-off timer option for 15， 30 ，60 or 90 minutes

Perfect for Home-office: the white noise machine does a great job on blocking the inside or outside noise for home-office to improve concentration， create confidential conversation.

Battery or adapter operated (adapter included)

Guarantee: this white noise machine offers a three-year limited warranty. Return or refund it if any problems.