Information about Nancy Guthrie's pacemaker helped authorities piece together a new timeline in her kidnapping. Can the devices track you?

Authorities believe Nancy Guthrie, 84, was taken from her home, outside Tucson, Arizona, "against her will," and they are now offering a $50,000 reward for information that leads to finding her.

Camron Guthrie today released a message in which the family asked whoever may be holding their 84-year-old mother to provide a way the family can communicate directly with them.