Vktech Ultrasonic Dog Chaser Stops Aggressive Animal Attacks Repeller Flashlight 100% Brand New and High Quality In normal situation, it can be used as a normal flashlight to illuminate at night Ultrasonic wave reaches up to 125db. Audible to dogs but not to human Effectively target animals up to 20m away Used to prevent dog attacks, issue ultrasound to repel the dog or wild wolf