Ultrasonic design: Based on the theory that a dog trainer can effectively train your dog to be obedient and prevent bad behaviors such as barking, digging, and chewing<br> In addition, they are harmless to humans and pets, and the sound can only be heard by pets<br>Easy to use: Open the battery cover first, and then insert the 9V battery (not included)<br> Only pets can hear the sound<br> Finally, turn on the switch and it can do its magic<br> If necessary, it can also be used as a flashlight<br>LED flashlight and battery indicator: The super bright LED flashlight function is very helpful when walking or jogging at night, and can also be used as a battery indicator<br>Portable and comfortable: Ultrasonic dog barking prevention measures approx<br> 12<br>5 x 4 x 2<br>5 cm (length x width x height), it can be easily put in a pocket<br> Ultrasonic dog bark prevention has a lanyard, which allows you to insert a dog bark control stop device wherever you need it, such as jogging or cycling, hiking, parking, etc<br>Multifunctional: In addition to being a pet trainer, it can also protect you from dog attacks<br> Suitable for training pets, police dogs, shepherd dogs and other dog breeds, suitable for outdoor work, travel and night security patrols<br>Product DescriptionAnti-barking device, ultrasonic wave deter dog barking, dog training auxiliary three-in-one control (dual speakers)<br>Specification:Frequency: 35-45HKZ<br>Sound pressure: 130db, maximum current: 130ma<br>Power supply: 9 V battery (not included)<br>Usable distance: within 6 mProduct Features1<br> Fmu is scientifically designed to protect you and not harm your pets<br>2<br> The 3-in-1 function can make your pet calm and stable when necessary<br>3<br> Our bark control device is light, portable and easy to use<br> *Warning*: We recommend that you do not deliberately tease the dog with this device, because the dog will gradually get used to it and will not hate it after hearing a lot<br> If the light becomes weak, the battery should be replaced in time<br> If you use alkaline batteries, it lasts longer<br> The battery is not included in the package<br> Dog repellents can be effective for most dogs, but sometimes they are not effective for large dogs<br>Includes: 1 x dog barking control device<br>