This is no white noise machine. It is a Shusher. A Baby Shusher. The Baby Shusher calms fussy, crying newborns with a repeating shhh sound. The same sound you speak to calm them during their crying spells. This is an essential sleep soother for crying infants, and an essential for any baby shower or gift registry. Twist the top to turn it on, and set a 15 or 30 minute timer. Twist the base to match the volume of baby's cries. Watch them calm down in seconds. The Easiest To Use. Incredibly Effective. Trusted by over 3 million parents. Used by more pediatricians and NICUs to naturally calm fussy babies. No App Required. Wireless, portable, and ready to work out of the box. Comes with 2 AA Duracell batteries installed. Quickly calms fussy babies with rhythmic “shush” sound. Adjustable volume and timer options for 15 or 30 minutes. Detachable lanyard helps attach to stroller, wrist, or changing table. Nontoxic and skin-safe. BPA-Free. Phthalate-Free. Latex-Free materials.