  In this paper we have extended our previous work \citep{probe1} and
considered spectral characteristics of interstellar non-relativistic Type-II
and Type-III Von-Neumann probes. It has been shown that by means of the proton
capture, required for replication, strong bremstrahlung emission will be
generated. We have found that for both types of civilizations the probes might
be visible mainly in the infrared spectral band, but as it has been found the
probes might be visible in the ultraviolet as well. For both cases it was shown
that differential power has dips for equally spaced frequencies, which might be
a significant fingerprint to identify such exotic interstellar objects.
