Kensington Expert Mouse K64325 Trackball I was using this as a sub-device about once a week until recently, and it worked without any particular problems. It has been used to a certain extent. The items for sale are only the main unit as shown in the images. *As it is also being sold in other shops, it may be removed suddenly. *Please refrain from purchasing if you are overly concerned about the condition, as it is a used item. #Kensington #Kensington #ExpertMouse #K64325 #Trackball #Mouse