A child locator that enables a parent to locate a child includes a master unit for wear by a parent and a monitored unit for wear by a child. The master unit may actuate an on-board alarm when its processor determines that the monitored unit is beyond a first predetermined distance and may actuate an...http://www.google.com/patents/US7511627?utm_source=gb-gplus-sharePatent US7511627 - Child locator
