PetSafe Sonic Bark control

PetSafe Ultralight Sonic Anti Bark Collar PUSB-150-19.
PetSafe Ultralight Sonic Anti Bark Collar Suitable for small dogs that cause a nuisance when barking.
When your dog barks if gives off an unpleasant sonic signal, your dog soon learns that when they bark the sound is given off, no bark no sound!
This remarkably light, 28g. collar emits an unpleasant but harmless tone to correct your dog’s barking problem.
The collar’s cutting-edge, bark-detection microphone can be adjusted to recognize your dog’s unique bark so that no other sound can set off the unit.
This collar is most effective when used on small dogs.