HSA/FSA APPROVED - Babysense is a highly sensitive device that monitors and detects even the slightest baby's movements through the mattress. | The Original non-contact infant monitor - Now with enhanced sensitivity - Lower risk of false alarms | Babysense sounds an alarm alerting to check the baby if no movement is detected within 20 seconds or if the movement rate slows to less than 10 micro-movements per minute. | The passive sensor system is totally safe and has no direct contact with the infant. | Two sensitive sensor pads provide coverage for the entire crib or bed area.