Compatible with the latest teaching materials. Power-on and pen tip reading have been confirmed. It can be used without any problems. There are no noticeable scratches or stains. I think it's clean overall. Please check the condition in the photos. The pen case in the photos is included. SD card and batteries are not included. If you are using teaching materials from before 2016, please prepare an SD card separately. Please refrain from price negotiations. Thank you. 0924