MULTIFUNCTIONAL: Besides being a pet training tool, it can also prevent your dog from attacking, suitable for training many kinds of dogs, such as pets, police dogs and sheepdogs , suitable for outdoor work, travel and safe night patrol. Remark : May not be effective for large dogs and ferocious dogs Ultrasonic Design: Based on ultrasonic wave theory, the dog trainer can effectively train your dog to be obedient and stop some unnecessary behaviors, such such as barking, searching, chewing, etc. They are also harmless to humans and pets. Easy to use: open the battery cover first, then insert the 9V battery (not included), only pets can hear sound, and finally turn on the switch to work normally, and can also be used as a flashlight if needed. Note: The effective range of this product is 20 feet Portable and Convenient: The device size is approx. 12.5 x 4.5 x 2.6cm (LWH), portable and portable, it is also convenient for you to go anywhere you need, such as jogging or walking, cycling,
