This is a bang for your buck white noise machine. My son will not nap without white noise. Someday we have to be out and about during his nap. This white noise machine gets loud enough to drown out the background noise without being too loud! I pretty much only use the white noise or zzz button now that my son is older. But I think the heart beat would have been nice when he was still a newborn. Just for calming him when he was fussy.
It really works very well for its size and price. I just wish I had it sooner.