Bottom Line: While somewhat heavier than other models of its type, the wide range of sound choices make this a model that even adults can use for their white noise needs. (sweetmomsblog.com)
The durable, high - quality materials can stand up to high volumes while giving you an amazing full range of sound from high to low. (geekwrapped.com)
And actually, in the brain, there's more neural area for the high frequencies than any other range of sound frequencies. (everywomanover29.com)