| 摘要 |
Personal security devices and methods are characterized in that a portable security unit includes a wireless telephone system interface connected to a global positioning system (GPS) receiver having a geographic position output. The interface is alsoconnected to an activation device for activating the interface, as in an emergency situation. Upon activation, the interface automatically establishes a connection with a wireless telephone system, dials a predetermined telephone number corresponding to a called telephone device and, upon connection to the called telephone device, delivers a message including the geographic position output to the called telephone device. |
