Alerts you with an alarm when it detects movement during sleep. A built-in high-performance sensor detects even the smallest movements of the baby. If no movement is detected for approximately 20 seconds, an alarm will sound. *This device is not intended for the prevention of Sudden Infant Death Syndrome (SIDS) or for the evaluation of sleep disorders (such as sleep apnea). Easy to use, simply attach it to the diaper, and anyone can use it right away. It's compact and palm-sized, making it convenient to carry when visiting relatives or traveling. I used it for a week after being discharged from the hospital. I haven't used it for very long, so I think the battery still has plenty of life left. 【BabySmile Official】 Infant Movement Sensor Baby Alarm E-202 | Baby Sensor Compact Portable Baby Danger Apnea Prevention Detection Monitoring Sensor Infant Movement Sensor Movement Sensor Nap Sensor Breathing Sensor Apnea SIDS Baby Alarm Gift for New Parents 【Baby Tech Award 2023 Grand Prize Winner】 Baby Infant Newborn Infant Monitoring Baby Goods Baby Supplies