1. A device, for use with a database, said device comprising: a field-detecting component operable to detect at least one of an electric field, a magnetic field and an electro-magnetic field and to generate a detected field signature based on the detected one of an electric field, a magnetic field and an electro-magnetic field; an input component operable to input the detected field signature into the database; an accessing component operable to access the detected field signature from the database; a comparing component operable to generate a comparison signal; and an identifying component operable to identify one of an item and a location based on the comparison signal, wherein said field-detecting component is further operable to detect a second one of an electric field, a magnetic field and an electro-magnetic field and to generate a second detected field signature based on the detected second one of an electric field, a magnetic field and an electro-magnetic field, and wherein said comparing component is operable to generate the comparison signal based on a comparison of the detected field signature and the second detected field signature.