the.com/bullhorn
A megaphone for people who'd rather be heard than agreed with.
means A handheld cone-shaped device that electronically amplifies the voice so it carries across crowds and distances.
from From bull (loud, like the animal's bellow) plus horn (the ancient shape that funnels sound); the bull's roar gave the gadget both its name and its attitude.
Power sourceModern versions amplify electronically, not just by shape.
Crowd mathCan reach hundreds without a single power outlet nearby.
Figurative lifeNow means any platform that broadcasts one loud message.