Keep pigeons, starlings, crows, swallows, gulls, woodpeckers, grackles and other pest birds away with this easy-to-operate sound system. This is a long-term solution for keeping birds out of large areas, as each unit can cover up to 1 acre. Sound system plays prerecorded distress and predator calls, keeping over 22 species of pest bird away. Dimensions L x W x H in. 10 1/2 x 3 1/2 x 4, Includes Prerecorded distress and predator calls, Mounting Type Minimal, Assembly Required No, Color Silver, Common Usage Bird repellent. Deters birds from large open areas, covering up to 1 acre Sound system plays prerecorded distress and predator calls, keeping over 22 species of pest bird away Water-resistant for outdoor use Light sensor-activated day and night modes Pre-recorded deterrent calls are played for 2 minutes at 10 minute intervals Uses a 110V outlet, can use a 220V outlet with adapter. Model Number: NTIB50. UPC: 764176080111.