The communication apparatus can also inform another person, such as a parent of the child, about the time that the child arrives home....http://www.google.com/patents/US7212114?utm_source=gb-gplus-sharePatent US7212114 - Communication apparatusAdvanced Patent SearchPublication numberUS7212114 B2Publication typeGrantApplication numberUS 10/523,171PCT numberPCT/JP2003/009755Publication dateMay 1, 20