This is a baby sensor. It detects a baby's movements and alerts you with an alarm if the baby rolls over onto their stomach. I bought it new in May of this year and used it for several months to detect when my baby was on their stomach. It gave me peace of mind. I am selling it now because my baby has grown and no longer needs it. I have confirmed that it is working at the time of listing, but please be sure to check its operation before use to ensure there are no issues. The seller is not responsible for any malfunctions or accidents that may occur due to this sensor, so please use it at your own discretion. I think it is clean with no stains, but please refrain from purchasing if you are concerned. It will be wrapped in bubble wrap and shipped via post. General medical device Set contents ・Movement sensor IMS-01 ・Instruction manual ・Attached documents ・Charging cable ※No box.