No, that isn’t the latest in dildonic (NSFW) technology sticking off the end of this mouse. It is simply a wrist rest that travels with the mouse, keeping your wrist nice, elevated and parallel with the mouse hopefully eliminating any kind of carpal tunnel lingering around waiting to wtf-pwn your wrist and hands. Other than the odd form-factor, the Well mouse is pretty average: corded, 800dpi optics, scroll wheel, couple buttons, you know, the norm. At least it keeps the wrist in good working fashion, for other wrist-intensive activities.
https://gizmodo.com/gizmodo-gallery-sex-machine-nsfw-136624