High Frequency Supersonic Dog Whistle

High Frequency Supersonic Whistle

100% new and high quality
This Whistle can help you to train your dogs to do many commands. Using this product can produce ultrasound sound waves and spread very far. Within 3km can be heard.
A dog can 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.
Unique sound and frequency, very suitable for any dog breed.