Logitech wireless mouse trackball ERGO M575S (old model). Purchased in 2022 and used for about 3 years. It was in use until recently, so there are no operational issues. There are no instructions or box. I have disinfected with alcohol and cleaned with an air duster, but please understand that this is a used item before purchasing. There appear to be no noticeable stains or scratches, but I think there may be minor scratches and signs of use. Please refrain from purchasing if you are sensitive to such things. I will also include the mousepad shown in the photos, but please let me know at the time of purchase if you do not need it. Logicool Mousepad Trackball Series: Ergo Model Name: ERGO M575