Purchased in October 2023. Used about twice. No stains or dirt. Includes the main unit, instruction manual, and battery installation pliers. A lithium battery was included at the time of purchase, but I used it in the main unit to confirm operation before listing. The battery is already installed, so you can use it right away. Thank you. 【Product Overview】 The Sense-U Smart Baby Monitor is a Bluetooth-enabled device for real-time tracking of a baby's abdominal movement, falls, and temperature. It works with a smartphone app, allowing you to constantly monitor your baby's health. 【Main Features】 - Abdominal movement tracking - High temperature alert function - Fall alert function 【Target Age】 Suitable for newborns and up, providing peace of mind. - Brand: Sense-U - Product Name: Smart Baby Monitor - Bluetooth Compatible: Yes - Functions: Tracks abdominal movement, falls, and temperature - Model Number: SU01B - Age Range: Newborns and up - Included Accessories: Monitor unit Thank you for viewing.