A computer-implemented method is executable by a first computing device to perform functions including retrieving, from the first computing device, sound information for the first computing device; receiving sound information from one or more second computing devices located in an area within a communication range of first computing device; generating a characterization of the sound information from (i) the first computing device, and (ii) the one or more second computing devices; and determining, based on the characterization, an attribute of one or more third computing devices.