The Portek Bird Yell Audio Bird Scarer is a powerful audio bird scarer. It features multiple sounds that replicate the sound of birds that are under attack from predators or the sound of the threat itself. This makes the Portek Bird Yell Audio Bird Scarer a very effective way to clear birds from farm buildings. Very easy to programme and use. The sounds available as standard are; Starling, Jackdaw, crow, canadian goose, greylag goose, barnacle goose, jay, sparrow hawk, kestrel, herring gull, black headed gull, common gull, wolf howls and a shotgun sound. The starling, jackdaw and crow feature a built in random timer that enable the BirdYell to be left unattended.