The chip is supposed to be invisible to both the naked eye and to X-rays. A person who carries it is supplied with an eight-digit code by the company. He, or she, is advised to divulge this only to next of kin or a trusted legal representative. In case of the person's disappearance, those in possession of the code are supposed to contact the company's control centre, so that the kidnapped victim's whereabouts may be pinpointed, and the police informed. The Sky-Eye is said to have a margin of error of just 150 yards.
Kidnapping is still common in Italy.
One recent victim, Giuseppe Soffiantini, an elderly northern industrialist, was wary when asked if he would buy one. They are treacherous. During his long captivity, his kidnappers cut off pieces of his ears and sent them to his family.