A lot of sounds that people make tend to be low frequencies, which also means they ted to travel a long way. So microphones are quite good at picking up those kinds of things. How do you work with local groups to insure that it's ok to do the monitoring? It's such a complicated socio political issue too, on who is narking on who and all o that. But in terms of goving o doing is eplacing microphones, that's something that lots of peopleann get involved in.