It keeps what it promises. It's been running for me for over 48 hours without any problems. I don't understand why they insist on adding songs to the mix since the music sounds horrible on these machines, but this one has the largest "library" of sounds (and music) of any White Noise Machine (WNM), that I have used and I have used several over the years as I have lifelong insomnia. My mom had the hardest time getting me to sleep and was the fastest at getting me to sleep on top of the dryer or by taking a fan from my dad's store and running it in my room - dad ended up buying a new fan and I let the old one go . loud in my room for years. At 18 I got my first WNM and took first place. It cost me $39.99 and I had to save up a few weeks to afford it and there were only 5 sounds in the library. So these modern sounds are a step forward and I really like them. I like that it's square because I can lay it on its side like a real speaker. That's one thing I never understood about WNM - they all seem to have upward-firing speakers, and that doesn't work in my opinion either. So it can be tipped away and I'm happy about that. Easy to use controls. The only issue I have is that I found it very difficult to unplug the power cord from the device. It fits like a glove, the connector is snug and there's nothing to hold onto other than the cable itself, which is a good way to wear the cable down. It's not a problem for me because I don't travel, but if you need to unplug the cable it might be a problem for you. So far I am happy with it and can recommend it. If this changes I will update this review.
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