Child alarm

摘要

A child alarm device consists of a guardian's transmitter and a child's receiver. The transmitter is held or carried by the guardian. The receiver is mounted inside a backpack worn by the child. If the child wanders out of range of the guardian's transmitter, after a short delay an audible alarm is triggered in the child's backpack automatically. One of the child's alarms can be triggered manually by the guardian. As an optional "Panic Button", the child can also trigger an alarm himself by disconnecting his chest strap. The child's receiver has one Group identification code and recognizes only one channel code. The guardian can control more than one channel within the same group ID code to watch over more than one child. The backpack has anti-tamper features such that an alarm will be triggered if someone tries to tamper with the backpack or molest the child.