On the page,
formatting link
, click on the "User agreement"
formatting link
. 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 purpose.