Works on any surface including glass! Brand new. $35 on Amazon. Asking for only $20 OBO. Cash, Venmo, or Paypal. Pick up at 10 Comstock Circle, Stanford, CA 94305.

Tiny Logitech Unifying receiver stays in your notebook - plug it in, forget it, even add compatible wireless devices without multiple USB receivers
Compact, sculpted shape for greater mobility and comfort
Hyper-fast scrolling lets you fly through long documents and web pages
Forward and back thumb buttons flip through web pages and photos faster than ever
Ships in Certified Frustration-Free Packaging
Source: http://www.amazon.com/Logitech-Wireless-Anywhere-Mouse-Mac/dp/B0082D5660/