The Kensington Orbit Optical Trackball offers comfortable operability via USB connection. kensington Orbit Optical Trackball K64327JP Thank you for viewing. Almost unused. I kept it thinking I might use it, but it didn't quite suit me, so I'm offering it for sale. Everything in the photos is included. Please refrain from purchasing if you are looking for a perfect item. Please purchase with the above in mind. Also, we are not accepting price negotiations. Thank you for your understanding. Functional problems... None - Brand: Kensington - Model Name: Orbit Optical Trackball - Connection Type: USB - Color: Silver/Black - Product Type: Trackball Body Thank you for looking. Connection type: Wired