beeper dog collar

Beeper for dog's,

beeper dog collar,

beeper of dog coller

It's a Beeper for Hunting dog's.
The hunter put it,on the dog's neck,like a collar.
Then, when the dog is moving fast,the beeper makes a slow motion "BIB".
And when the dog is moving slow or no move,which means that have find the "Bird", the "BIB" becomes very quick.