General description Multifunctional ultrasonic dog trainers serve as effective tools for pet training and personal protection against aggressive dog attacks. They are suitable for various types of dogs, including pets, police dogs, and shepherd dogs, making them ideal for outdoor work, travel, and night security patrols. However, please note that they may not be effective on large or particularly aggressive dogs. Technical specifications Ultrasonic design that emits sound only audible to dogs Effective range: 20 feet Dimensions: 12.5 x 4.5 x 1.5 cm (length x width x height) Usage Train dogs to stop unwanted behaviors such as barking, digging, and chewing Can be used as a flashlight when needed