SAFE USE - What can you do when your pet dog starts to bark? With an ultrasonic trainer, you can train your pet to obey, correct misconduct and stop barking. It stimulate the visual and hearing of dogs, cats and other animals without any impact on people . PORTABLE - The size of the anti dog barking device by BSTORE is approximately 4.9 inches by 1.6 inches. This is portable and handheld, and it is also convenient for you to carry with you, such as jogging or walking, cycling, parks.Rogue dog will no longer pose a threat to you. CONVENIENT OPERATION - Model upgraded in 2018, use 9V battery (not included), increased the frequency of the ultrasonic wave, and the brightness of the LED light,only the pet can hear the sound.(Low-priced products on the market advise you not to buy, you can look at their evaluation, buy home can only be used as a flashlight) MULTI-FUNCTIONS - It also can as a pet training tool, fit for training many kinds of dogs, such as pets, dogs in police and shepherding, suitable for outdoor work, travel and security night patrol,but sometimes it won't on those giant dogs. ▲▲▲CUSTOMER IS GOD - If you have any dissatisfaction, please contact our online customer service in time, 100% refund is our aim, you are my God.