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One is the discomforting but not harmful high frequency sound (20,000Hz-25,000Hz), audible to dogs but not to humans. And, the second is a super bright LED flashing strobe that temporarily blinds and confuses the dog.
Helps stop the approach of unwanted dogs up to 40 feet. Also has a training setting. Requires on 9 volt battery. Can be used as a flashlight.
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