Bird B Gone Bird Chase Super Sonic is a programmable sound deterrent used to deter birds from large open spaces. Birds hear on the same level of humans and do not hear ultrasonic noises. The Bird Chase Super Sonic features actual distress and predator calls of over 22 types of birds. These sounds are broadcasted in ten minute intervals to alert birds of danger. When birds hear these calls, their natural instinct is to flee the area. The Bird Chase Super Sonic bird deterrent is ideal for backyards, rooftops, large open spaces. The Bird Chase Super Sonic is meant for outdoor use and can be programmed to turn on/off at night. Bird Chase Super Sonic includes a general setting to deter birds and can also be specifically programmed to deter pigeons, crows, seagulls, starlings, woodpeckers, and grackles. Bird B Gone Bird Chase Super Sonic includes a standard 110v power cord and one internal speaker for coverage up to one acre. Additional satellite speakers are available for increased coverage up to five acres.Our Customer Service Team can be reached at 800-392-6915.