This is an infant movement sensor that detects body movements, including the infant's breathing. It accurately detects the infant's movements during sleep and alerts with an alarm if no movement is detected for 20 seconds. Recommended by a midwife, I purchased it new and used it. (About the product) - Brand: Babysmile - Model Name: Baby Monitor - Function: Sound sensor - Condition: I think it's in good condition because it was only placed under the baby bed mattress. - Accessories: Only the items in the image. There is no box, instruction manual, or batteries. - Operation: Good, confirmed (About shipping) - Ships within 2-3 days. Please comment if you have any questions.