Smile Design Infant Movement Sensor Baby Alarm E-201 Official Retail Price: ¥9800 (tax included) Used at the maternity hospital, I purchased it after discharge and used it only during the newborn period. Comes with box and instruction manual ( ¨̮ ) Please check the condition in the photos. Although it may vary from person to person, it worked well for us even on a mattress about 6cm thick. It alerts you with a loud sound if the baby's movement stops for 20 seconds, so I was able to sleep peacefully during the newborn period. (It detects even small movements that are not visible, so there were no false alarms.) ※ Do not judge the baby's condition solely based on the movement information from the Baby Alarm; always check with a parent or caregiver. - Brand: Babysmile - Product Name: Infant Movement Sensor - Features: Detects the baby's movement with a sensor built into the panel. Alerts with an alarm if movement stops for about 20 seconds. - Overview: Sensor panel, high-sensitivity piezoelectric sensor type, control unit, equipped with an alarm and LED lamp, requires 3 AA alkaline batteries (replace as needed) - Website: https://www.babysmile.ne.jp/babyalarm/