Used in January 2025. Used about 5 times and then stored at home. No longer used as we started co-sleeping. There is one black stain. Please check the photos. Operation confirmed in December 2025. Batteries not included. Will send with the box. Please understand that this is stored by a private individual before purchasing. Returns are not accepted. A baby alarm that uses a high-performance sensor to detect the baby's movements and alerts you with an alarm if there is no movement for 20 seconds. - Brand: BabySmile - Model Name: Baby Alarm E-201 - Function: Equipped with a high-performance sensor - Alarm function: Notifies if there is no movement for 20 seconds - How to use: Place the sensor under the mattress - Applicable mattress thickness: Up to 6cm for firm cotton type Name: Infant body movement sensor Baby Alarm Model number: E-201 JAN code: 4580211771853 Target age: 0 months to 12 months (2kg to 10kg) Medical device certification number: 13B1X10068000203 Medical device classification: Class I general medical device Power supply: 3 AA alkaline batteries Materials: Control unit: ABS Sensor panel: PP Size: Control unit: 70 x 70 x 35mm Sensor panel: 280 x 300 x 12mm Contents: Control unit, sensor mat Instant purchase is welcome. We may change from Rakuraku Mercari delivery to Yu-Yu Mercari delivery without notice.