When it comes to dog bark control, ultrasonic bark control devices are one of the most popular and safest methods. This MODUS ultrasonic bark control device uses the most advanced ultrasonic technology making our device a safe and effective training tool. The effect of the product is not only related to a dog breed, dog age, hearing sensitivity, temper, but also closely related to whether the owner uses the product correctly. <br><br> When the dog has bad behavior, you can press the button and give out the ultrasonic sound, and your dog will feel scared or shocked and then stop misbehaviors. When the dog stops the bad behavior, you stop pressing and no more ultrasound released. At the same time, you need to use an ultrasonic trainer in conjunction with the command requirements or appropriate action guidance like touching, snacks, or verbal comfort to achieve the desired results, once your dog accepts the ultrasonic bark controller correction and stops barking, you can give the pet appropriate rewards, such as snacks, petting, etc., to actively guide and strengthen the dog's memory. The dog will eventually learn to associate the barking with the ultrasound, forming a conditioned reflex and will stop barking this misbehavior.<br><br>The conditioned reflex of the dog usually takes 3-10 days to form, adapt and consolidate. During this period, the owner ought to continue to train the dog with patience. If you can't achieve the results you expect, we are very sorry, we will do our best to improve the performance of the products.<br><br><b>Note: </b><br>1. The product may not be effective on dogs with hearing problems. <br>2. The product cannot be used for dogs under six months whose hearing is under developing. <br>3. This device is not intended to provide protection against aggressive dogs. <br>4. Different dog breeds may react to the ultrasonic sound differently. <br>5. For optimal results, please use the product as a training aid, along with other tools/commands.