Last Forever!
I have a model 454 that must be at least 30 years old, and it keeps on going.  I've tried electric white noise makers over the years, but they just aren't the same.  Can't really explain why, they just aren't.  When mine finally conks out, I'm definitely going to get another one!  I live in a noisy area, a bad one too with gunshots, loud cars, noisy neighbors and the like, and this unit does an amazing job keeping the noises down.<br /><br />Just did a Google search for the model 454, I got this...<br />"It is billed as, "Sleep-Mate" by Marpac of Wilmington, N.C.. It is model number 454.<br />This item is circa the 1960's. "<br /><br />1960's!!!  Wow, guess it's lasted longer than I thought!
Rating: 5 stars