Protect yourself from dangerous dogs while cycling or walking or jogging with the sonic animal chaser. It produces a high 25 KHz frequency sound that the human ear can not detect yet it is able to deter vicious dogs without harming them. This animal chaser has an effective range up to 20 feet (6M) with a prime operating range of 5 to 6 feet. To make sure you are pointing the chaser at the right place a laser sight is built-in. It is even safe enough to use for training dogs and cats. The sonic animal chaser is the safe and effective and humane way to repel dogs or cats or squirrels and other garden pest. The sonic animal chaser measures in at four and five-eight inches. Requires one 9 volt battery that is not included.