Material: This hand held dog trainer is made of plastic material, which is safe and reliable, not easy to wear, durable and can be used for a long time.It pushes the barking dog towards you, but it is harmless to the dog. Ultrasonic Bark Stopper: This portable dog trainer uses ultrasound technology; it generates ultrasonic waves when applied; the frequency of the ultrasonic wave can prevent your dog from barking; it is suitable for dogs of all breeds and sizes; the audio frequency is safe for pets and humans No effect on the ears; but can not be applied too long time, it may be ineffective for dogs Easy to use: open the battery cover first, then insert the 9V battery (not included), turn on the switch, it can be used to train the dog, as long as the battery is charged, it can work normally and it can be used as a flashlight when needed Multiple uses: this dog repellent trainer portable warns dogs not to bark softly; It can be used as a dog repellant and dog training aid to prevent bad
