Review on Yogasleep Rohm Portable White Noise Sound Machine + Travel Case In Grey (Pack Of 2) Sleep Therapy, Crush-Resistant Travel Case, For Adults, Kids & Baby, Noise Blocking & Office Privacy, Registry Gift by Predrag Hall

Our power in town kept cutting off and on due to weather. Our little one sleeps with a fan (for sound), so it kept turning off and on, waking her up. With this, I was able to keep it plugged in and on as a faux fan all night and if the power went out it would just switch to it's batter use and continue humming without pause, so she could sleep uninterrupted. Then we could take the same fan on trips, so she always has the same fan sound to sleep to. It is small and portable. There is an Arctic snowstorm high pitch windlike sound, a deep hum, and an ocean like sound. The volume controls let you make it very quiet or pretty loud. There is a yellow light that pulses different speeds to tell you it's battery life. I had to cover the light with a blanket, so she wouldn't notice it. The battery drain speed depends on the volume that you use. I had a higher volume on, since cars outside can be noisy and the sound machine was distanced from her enough that the extra volume was needed, so the sound machine could not run all night without staying plugged in. It could remain unplugged for long naps though.