Adjustable frequency:
Different dogs respond to different frequencies. Dog whistle produces a range of fund frequencies between 5.4 KHz and 12.8 KHz when turned. The dogs whose ears are much more sensitive to this frequency, but it cannot be insignificant for human hearing.
Tips:
The voice of the dog whistle is not quiet, only quieter than you think. Many people can't hear the sound of the whistle clearly, but your dogs do. Dogs are much more sensitive to this frequency than humans. Don't worry about it.
Package includes:
2 x dog whistles(Black&White).
1 x lanyard