| 摘要 |
A child distance and alerting system comprising a transmitter unit to be attached to a child's clothing and a receiver unit to be carried by a parent or guardian supervising the child, for preventing the child from wandering too far and becoming vulnerable to predators. The transmitter unit includes a disc-shaped body, a pin portion extending outwardly therefrom for piercing an article of clothing, and a pin-receiving component adapted for releasably clamping the pin portion so that the transmitter unit can be attached to the child's clothing. Once the pin portion and the pin-receiving component are properly joined, the transmitter unit cannot be removed from the child's clothing except by use of a special tool. The transmitter unit is designed to transmit radio frequency signals when it is attached to the child's clothing and remains activated until the pin-receiving component is removed from the pin portion. The receiver unit receives the radio frequency signals sent by the transmitter unit and produces either an audible warning sound or a silent vibrating warning whenever the transmitter unit has traveled outside the predetermined distance from the receiver unit. The receiver unit will also alert the user when an unauthorized attempt has been made to remove the transmitter unit from the child.
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