Here we have the Apple Lisa Original Mouse. It is a vintage rare accessory designed specifically for the Apple Lisa computer. This authentic piece is a must-have for collectors of vintage computing memorabilia. With its compatibility with the Apple Lisa brand and its original design, this mouse is a unique and valuable addition to any vintage computing enthusiast's collection. Item is being sold as is with no returns. It has been sitting in my desk for a long time and it was working the last time I used it but at present I have no way to confirm. The mouse button when pressed gives a nice crisp satisfying click. Please feel free to contact me if you have any questions prior to purchasing. Thank you...