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About Ultrasonic Repellers: Many animals can hear these devices but people can’t. So when target animals are exposed to their irritating or loud sounds they tend to stay away–just like you wouldn’t buy an apartment near a busy airport if you had a choice. Ultrasound is blocked or reduced by obstructions (it is completely blocked by walls)–so ultrasound devices work better in clear yards than in cluttered landscapes. Animal Away™ Ultrasonic Repeller
This device has an effective range of 30 feet and a sound emission frequency of 23 Khz (inaudible to people). It works off a single 9-volt battery (not included), is suited to both indoor and outdoor use, and effectively repels dogs, cats, and raccoons as well as squirrels. Animal Away’s motion detector causes its ultrasound generator to operate only when motion is detected, thus extending the battery’s life and keeping target animals from becoming accustomed to its sound. The product comes with a 6-month limited manufacturer’s warranty. Yard Gard: ultrasonic repeller, AC or battery powered yard and garden protector by Bird-X
A strong and versatile ultrasound generator designed for both indoor and outdoor use, the Yard Gard can repel raccoons, squirrels, dogs, cats, skunks, deer, armadillos, opossums, rats, bats and other animals without disturbing birds or fish. Well-suited to protecting yards, gardens, patios, porches, greenhouses, garages, and building interiors, the weatherproof Yard Gard covers an area of up to 4,000 square feet and is easily mounted on a pole or flat vertical surface by means of keyhole slots at the back of the unit. The powerful (100+ decibels at 3 feet) ultrasound emitted by the Yard Gard can be adjusted to a wide range of frequencies (15,000 to 25,000 Hz) to deal with specific creatures. Powered either by 4 "C" cell batteries (not included) or by AC current, the Yard Gard comes with a 30-foot extension cord and a 110 volt AC adapter that has its own 6-foot cord. If set to operate intermittently (in either battery or AC mode) the unit will only generate ultrasound when its motion sensor detects movement within the sensor's 35 x 70 foot range. However, the unit can also be set to emit sound continuously if it is working in AC mode. Some people with good high frequency hearing can hear the unit at its low (marginally sonic) frequency settings, but this situation can be resolved by selecting higher settings. |
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