Hand-held training aid produces a high-frequency sound that's discomforting to dogs, but completely harmless. Inaudible to humans, it works at the press of a button-helping reinforce your verbal commands. Also discourages the approach of unwanted dogs from up to 15 feet. Requires one 9-volt battery (not included). Plastic. 4 1/4" long x 1 3/4" wide.Price:
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