Made in USA The DAZER is a compact handheld ultrasonic dog deterrent designed for use by the general public to protect yourself from aggressive, unfriendly dogs. Walk, jog, bicycle, work and enjoy the outdoors without having fear of stray, unfriendly dogs. How does it work? The DAZERs output startles the approaching dog causing most to stop, move away or stay in place allowing the user to avoid contact with the animal. Effectiveness of the DAZER is based on emission of sound and many factors that can determine its performance. The distance from the dog, age, temperament and training of the animal can all affect the reaction of the animal.๊United State