Personal digital assistants; emergency alert security system composed of transmitters, receivers and computer telecommunications software for transmitting and receiving emergency signals and data to and from wireless handheld units and devices, namely, personal digital assistants, wireless phones, mobile phones, cellular phones, smartphones, video phones, handheld, mobile computers, and tablet computers; electronic devices for locating and tracking children using global positioning systems and communication networks; GPS tracking device to be worn on the body for locating and tracking people, namely, for use by parents in tracking the movements of their children using a variety of communications technology, applications, web portal and a smart back-end platform; electronic personal emergency response system and devices to be worn on the body, namely, personal emergency alert devices with at least one button that users can push to send pings to smartphones and send personalized text messages or initiate phone calls to pre-selected contacts in the event of an emergency or need