With three pre-programmed sounds, the Sonic Bird Repeller is the perfect ally for keeping your garden nuisance bird free without harming the bird. Sounds include predator bird and starling distress call Safe for other animals and pets Includes both wall mount and ground spike for flexible positioning Up to 60 degrees of rotation Works on a looped cycle or infrared motion sensor setting LED light smartly indicates settings and low battery Uses four C-size batteries (not included) Universal power kit available for mains power