Thank you for viewing. This is a Logitech trackball wireless mouse. I purchased it 5 years ago. The condition is good because I haven't used it much. I am selling it as part of decluttering. I have confirmed that it works. I am a non-smoker, live alone, and have no pets, so the hygiene is good. I will ship it promptly. Thank you for your consideration. - Brand: Logicool - Model: Wireless Trackball M570 - Ball Color: Blue - Design: Ergonomic design - Connectivity: Wireless - Number of buttons: 5 - Power: Uses 1 AA battery