This comes with an instruction booklet in various languages. Just what do you have to explain about a mouse? "Plug it in and use it", one would think. Well, Microsoft manages to write eleven pages of instructions and warnings!
It starts out pleasantly enough: "Failure to take the following precautions can result in serious injury or death from electric shock or fire[...]"! Just how a USB-powered device (5V and a maximum of 500mA) could electrocute you is left unexplained... No wonder the TSA is authorised to confiscate laptops: in combination with an optical mouse from Microsoft, a terrorist could easily eletrocute everyone on board of an airplane!