The Nanny is designed to continuously monitor the baby's slightest movements. If no movement is detected after 20 seconds, the Nanny will trigger a loud acoustic and visual alarm. Compared to other similar monitors on the market, this is the only device that has been selected for use in hospitals and households. The Nanny is certified as CE medical device by the European Union authority and complies with part 15 of the FCC rules, and with CPSIA. Moreover, because it is battery operated and wirily connected to the control unit, there is no risk whatsoever of electrical hazards or radiation to your baby