No Bark Dog Collar

The sonic, bark-control collar emits a safe, high frequency tone when yourdog barks. This sonic wave, that only your dog can hear, is not harmful orpainful. Distinguishes between annoyance and rapid, intruder-alert barking.An effective dog trainer any dog owner needs. 3/4" thick nylon adjustable collar fits necks up to 21", Requires one 9-V battery (not included).-The Safe, Effective Way to Hush Howling Hounds!;