black and white line drawing of a megaphone with handle for announcing, cheering, and communication purposes

vector simple illustration minimalistic outline placeholder monochrome communication black and white contour device announcement sketch broadcast line drawing sound reminder alert marketing graphic design handle megaphone promotion advertising outreach message attention rallies public speaking cheerleading speaker amplifier noise handheld horn loudspeaker event protest crowd advocacy attentiongrabbing inform engage rallying publicity noisemaking art bstyle