• Mimics the predatory sounds of hawks & owls• Sea gulls, crows, blackbirds, pigeons & even some common rodents will all flee from the sound• Motion Detector mode triggers the predatory bird signal if any movement is sensed in a 130° area up to 30 ft• Timed interval mode can be set to produce the signal in adjustable periods of 5–30 min• Equipped with a photocell that automatically turns the unit off when it gets dark when the activities of most birds cease