This small portable natural sleep machine is perfect for the traveler or someone with little side table space.  It have a plug for electric or it has battery use.  I enjoy the summer night selection best.  It also has ocean, rain, brook, ocean, thunder and white noise.  There are also 15, 30 and 60 timer for self shut off.  
 Thank yoy for allowing me to try this product. [This review was collected as part of a promotion.]