Screamers produce a loud screeching noise through complete travel. In low light they have a strong visual effect. With a range of 250′ to 300′, these unique pyrotechnics produce an alarming sound, resulting in an immediate fear response in birds and animals. Also known as Racket Bombs, Crackers, Whistle Bombs, Screamers-Sirens, Twin Shot, and Knatterpatronen.