Able 2 Sho-Me SHO-ME Megaphone with Whistle Signal SHO-ME Megaphone with Whistle Signal $195.05 Megaphone Models 19.0156 Features Clear voice projection to an acoustic range of 3/4 to 1 mile without strain. Rated power output of 15 watts (20 watt max.) Adjustable volume control. Voice mode... Quick view See Options Add to Wish List