Silbato de perro Hivernou para detener el ladrido, ajustable ultrasónico, silbato de entrenamiento de perro silencioso, control de corteza para perros, 1 paquete de silbato para perro con 1 correa de cordónEasy to use Dog Training WhistleWith adjustable frequency,Hivernou dog whistle allows you to train your dog to stop barking , sit, come, lay down,stay and so on through ultrasonic of the whistle. Safe Dog Whistle to Stop BarkingMade of harmless material, Hivernou ultrasonic dog whistle can help to stop your dogs useless barking without any damage to their hearing. You can use this silent bark control whistle for dogs training without any health