ITEM NAME:Sliver Dog Trainer-Obedience WHISTLE Pet R4M3 Pitch Sound Supers P9K2 Description&Preview.Ear of dog to receive sound waves per second, 120 kHz, while the people can hear up to 20 kHz. Dog whistle can be issued in addition to the human voice can be heard outside the tube, while the sound people hear is, only dogs can hear frequencies, this frequency ultrasound transmission is very far, so the dog can be very far away hear the sound.
