Adjustable FrequencyThe dog whistle can be adjustable to multiple frequencies which can easily train your dog unlimited commands, rotate the adjustable nut to find a suitable pitch frequency for your puppy. Easy Dog Training WhistleAdjustable frequencies of silent dog whistle allow you to easily teach your dog/puppy unlimited commands such as stop barking, sit, come, lay down, stay and more. Safe Dog WhistleOur dog whistles made of safe material, our whistle allows you to train your dog without any health concerns. The ultrasonic dog whistle will not hurt your dogs hearing so you can use the silent bark control whistle for dogs to stop useless barking. Outstanding Bark Control Whistle And Anti-LossOur dog whistle is designed reasonable small size & comes in premium metal, Long lasting and rustproof. New dual anti-loss features with special lock nut & cover with a free lanyard. High Quality lanyard strip allows you to take your dog whistle to anywhere without worrying the lost. Enhanced Canine Communication FacilitationOur dog whistles facilitates improved communication with your dog. Please be aware that effective usage of the dog whistle necessitates a training process for achieving obedience in response to your commands.