On the page,
click on the "User agreement"
You don't actually purchase this gadget. You merely buy
a non-transferable owner-only license to use it.
(I guess this is the answer for people whose neighbors are
always borrowing their tools.)
Another interesting feature of the license: they even
disclaim the "warranty of merchantibility." In other
words, they disavow any claim that it works for the advertised
Rick Matthews email@example.com
Department of Physics http://www.wfu.edu/~matthews
Click to see the full signature.