This is a gyration mouse, missing the box, but unopened from the package. Comes with mouse, receiver, charger, software, and A/C adapter. Basically, you can use this mouse in the air - use your wrists to move the cursor. For a review, visit here: http://reviews.cnet.com/mice/gyration-go-2-4/4505-3148_7-31428447.html. Pick up on Stanford campus only. Price is $60 OBO (I bought for ~70). Thank you for looking.