The Angelcare Movement Sensor with Sound Monitor is probably the most well-rounded baby breathing monitor and will take away your anxiety. The beauty of this device is that it is a baby breathing monitor and a baby safety monitor all in one! The Sensor has three modes of use and can not only be used for babies, but can also be used into your child toddler years and beyond. The actual breathing and movement sensor pad is placed under the center of the crib mattress on a flat, hard surface. A separate nursery unit will send the sounds to the parents receiver unit. If no movement is detected for 20 second, an alarm will sound. The Angelcare Movement Sensor with Sound Monitor can work separatly as a baby breathing monitor only, as a baby safety monitor only or do both. This monitor can also comes in a deluxe form with temperature sensor to help you monitor your little one surrounding environment.