* The ultra-sensitive sensor pad is 40% larger than the next size down of other similar devices on the market, and therefore it has a better coverage. It goes underneath the crib mattress and detects the smallest movements of the baby's chest. * Suitable for thick crib mattresses of up to 5.5 inch height. * The European Nanny - The baby care expert * If no movement is detected, the Nanny will trigger a loud acoustic and visual alarm. * The Nanny Monitor can easily be used in more than one place simply by using additional sensor pads.