We have a newborn baby and after reading about SIDS, we've been very conscious of the baby when he's sleeping. A friend of ours recommended we got a sensor like this and so we jumped at the opportunity to order it.In a touches very easily and doesn't really get in the way. It hasn't really gone off because the baby hasn't stopped moving or breathing but, when testing it did work.Fortunately we haven't been startled by the alarm but it definitely makes us feel comfortable knowing that the baby is being monitored by this device.