I picked this machine since it had various frequencies of "white noise," aside from the standard "white noise," which has a higher frequency and I don't tolerate well. I prefer the mixed and lower frequencies. I am very happy with my choice and the wide range of frequencies to choose from. I have a neighbor down the street who lets their dogs bark non-stop all hours of the night and into the wee hours of the morning, along with other nuisance noise that prevents sleep. This machine drowns it out and lets me FINALLY sleep! I was using earplugs and an air conditioner or fan before, but they weren't cutting it. It's also nice to have on when I'm reading, studying or trying to concentrate. I would recommend this machine for anyone with sensitive hearing, who doesn't tolerate the standard high frequency white noise on most white noise machines. With this machine, you have a wide range of choices in frequencies for various scenarios.
I noticed others who reviewed this product claimed it didn't work, or that it only had one sound. Perhaps they are unaware that "white noise" comes in a wide range, and/ or their hearing couldn't pick up on the range available on this machine...or, maybe they misunderstood the purpose of the machine and what it offers. It definitely works, has a wide range of "white noise" to choose from and volume control to suit to preference. It starts out at the highest standard white noise frequency, then as you press the "sounds" button, it plays gradually lower frequencies equivalent to pink, brown, gray noise, etc...I recommend starting at white noise and pressing through all the selections a few times over....this might help others to pick up better on the range available and find a frequency that suits their needs best. The higher frequencies are supposed to be better at masking or drowning out nuisance noise. Pink noise is supposed to be therapeutic for hyperacusis and tinnitus. The lower frequencies are calming. It also has a headphone jack and another outlet to hook up to an mp3 player. I highly recommend this product. It works and, thus far, seems to be a quality product. It's the solution I've been looking for.
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