Abstract: A method for uniquely identifying and locating one or more electronic devices by means of a data-bearing signal transmission is disclosed. The method is specifically configured to locate a large number of similar electronic devices. In one embodiment, a receiving side system assigns a unique digital identity to an electronic device by means of a data transmission network. The electronic device subsequently processes this unique digital identity and constructs a waveform to encode the identity in a manner that can be transmitted. The waveform is converted to a propagating signal by means of an optical transmitter. The signal is received by an optical receiver and converted to an electrical signal that is subsequently processed to determine the unique identity encoded. Methods of encoding the identity in the frequency domain representation of the waveform, and identifying device location by means of a sensor array, are disclosed.

Abstract: A protective device for a portable electronic device to draw attention to the user in an emergency is disclosed. A personal protective device for a portable electronic device comprising: a case configured to fit tightly around the portable electronic device such as a smartphone; at least one sound and/or light emitting device coupled with the case; one or more means for receiving an input, the input being configured to actuate the at least one sound and/or light emitting device; whereby the at least one sound and/or light emitting device is configured to generate a high volume of sound and/or light upon actuation thereby to attracting attention during an emergency. The sound and/or light emitting device is arranged inside the case and is capable of generating a high volume of sound and/or light in an emergency situation.

Abstract: A protective device for a portable electronic device to draw attention to the user in an emergency is disclosed. A personal protective device for a portable electronic device comprising: a case configured to fit tightly around the portable electronic device such as a smartphone; at least one sound and/or light emitting device coupled with the case; one or more means for receiving an input, the input being configured to actuate the at least one sound and/or light emitting device; whereby the at least one sound and/or light emitting device is configured to generate a high volume of sound and/or light upon actuation thereby to attracting attention during an emergency. The sound and/or light emitting device is arranged inside the case and is capable of generating a high volume of sound and/or light in an emergency situation.