The LRAD on the Eve of the Convention
This is the NYPD's LRAD (Long-Range Acoustical Device) deployed on Seventh Avenue immediately north of Madison Square Garden during the United for Peace and Justice protest march on the eve of the Convention.
Protesters were forced by the NYPD to turn right at this point (there are barricades and additional police in front of the LRAD) as per an agreement with UFPJ.
Note the large black circle mounted on the Humvee. This is the actual sound device.