This listing is for a Kensington K72337 Orbit Smooth Trackball with Scroll Ring Marble Mouse M01047. Condition: Tested, Good Working! The mouse has writing on it, probably with a permanent marker, but it works great! See Photos. USA SELLER !!! Ships from Austin, Texas !!! We are a Mom and Pop local business!!! All the money is spent back in the local and US economy!!! Thank you for the business!!! FAST SHIPPING!!! This is a blue marble trackball mouse. Item is in good shape w/ some wear to case. Optical tracking technology provides precise cursor movement for superior accuracy so you can get where you want on the screen Quickly with less hand movement, improving productivity and efficiency; The blue 40mm ball has been specially designed with an absolute spherical, hard surface for precise tracking and control Unique scroll Ring let you move up and down web pages or documents with ease; ambidextrous design works equally well for both right-handed and left-handed users