I do not really understand some of the negative review regard this product . it be light and compact ... you can take it with you on trip and just play it with battery . there be twenty different sound , and quite frankly some of they be unnecessary if you be look for relax sound -lrb- such as City , Heartbeat , Steam Train , and thunderstorm -rrb- , but there be plenty of relax sound as well . you can play the sound indefinitely , or you can set it to run for 15 , 30 , 45 , or 60 minute . as a bonus , you can plug it in and it can act as a clock and alarm as well . when you consider the price and all that you get , this be a really good deal . I be buy another one .