JAVONTEC Portable White Noise Sound Machine with 6 Nature Sounds. Sleep Therapy System with USB Charging, Headphone Jack and Timer, Adaptor and AA Battery

It is small and has the option to plug in or be battery operated (and it comes with batteries!). I can take it on the plane or on roadtrips and it even has a headphone jack so I can listen and relax and not disturb anyone. I love the USB port so I can charge my phone. The ocean sound is my favorite. I just set it before bed and the automatic timer turns it off.

Love this product! The kids can be as loud as they want and I can still sleep!