Amazon.com Review
By generating ultrasonic sound waves, this battery-operated device repels dogs, cats, skunks, opossums, raccoons, and armadillos from yard or garden. It's humane, an alternative to traps, poisons, and chemicals. The device is motion-activated, automatically sending out sound waves when a pest is detected within an area of up to 4,000 square feet, and operates for up to six months on four D-cell batteries (not included). A knob adjusts sound-wave generation to one of seven different levels (from 14,000 to 26,000 Hz), depending on the pests present. (A guide on the back matches settings to pests.) Though lower-range sound waves might be detected by pets and humans, they are not harmful. The weather-resistant device is encased in rugged plastic and measures 6-3/4 by 4-3/4 by 3-1/4 inches. It mounts on a flat surface or on a pole. Mounting brackets for both are included. The device carries a two-year warranty against defects.
--Fred Brack
Product Description
The Model 0051 Yard and Garden Protector uses multiple frequencies to repel a wide array of outdoor pests. A built-in motion detector activates the unit when an unwanted pest is active in the protected area. Mounts easily to most any surface with included mounting brackets. Uses 4 "D" cell batteries. Emits ultrasonic and sonic sounds ranging from 14 to 26 KHz.