The difference between the items:
Item# 168374, Bird-X Ultrasonic Deer Repellent, is for the removal of Deerskin. It has a sealed temperature resistant plastic, and includes two motion settings.
Item # 168383, Bird-X YardGard Ultrasonic Animal Repeller, is for the removal of Animals (deer, raccoons, rabbits, squirrels, armadillos, rodents, bats, stray dogs and feral cats,) the unit is made of ABS plastic and has one Motion sensor.
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