The acoustic bird deterrent is capable of keeping pest birds away in a natural way.It is designed to keep pest birds away from all areas that need protection and where pests could cause serious damage.Acoustics include Starling, Crow, Magpie, Pigeon, Seagull, Heron, Woodpecker, Jay, Boar and Deer, Gun shots, Barking Dogs and Alarms. Please note: External trumpet is an extra option and can be purchased below as an add on to increase the Coverage Area by 2 Acresincluded in the box are 2 jacks, giving you the option to use it via electricity or with a 12V Battery.