This is a non-contact, highly sensitive body movement sensor that monitors a baby's sleep. I purchased it on Amazon in August 2024 and used it for about 10 months. By using this product in conjunction with a baby monitor camera, I was able to be in another room with peace of mind. Includes: - Control unit (main unit) - Sensor pads x 2 - Instruction manual - Control unit holder - Hook - Battery replacement tool Please prepare 4 AA batteries separately. There is a crease on the tag attached to the cord (see photo 2).