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This device emits an ultrasonic sound that is very faintly heard by humans when it comes close to the ear, but dogs hear it with a very strong intensity and it irritates them because they cannot stand that sound and therefore run away... That is why it is a good defense against dogs that annoy and disturb you... it is functional at 5 to 10 meters.... It runs on a 9 volt battery that comes free with this device.. New condition
Category: Shops, Trade / Surveillance / security