Description

Features:
Animals can receive 120 kHz sound waves, while human only can receive 20kHz sound waves. This ultrasonic adjustable whistle can make tubular sound that human can hear, at the same time the sound is not heard by human, only the frequency that the animal can hear. Transmission distance is far. So this whistle can be used to call back animal, and it is not noisy.
The ultrasonic frequency can reach 20Khz~120Khz and can be heard in 2km.
It is a good tool to establish communication with dog, dove, hawk.
Suitable for dove, birds, parrots, rabbits , etc..