Baby Shusher sleep soother is made from strong and durable BPA-free material and is very easy to clean. It is a great tool to soothe a fussy baby. It aids to stop the baby from crying by engaging them in the natural calming reflex. The rhythmic shush reminds the baby of being inside the womb, where there is a constant inundation of loud sounds from blood flow and other in utero noises (up to 95 DBS). These sounds, which may initially seem harsh, are very calming to a baby. Also, it has a user-controlled block timing option with which the sounds can be switched on for a 15-30 minute duration.