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ZelenDecor Anti Barking Device, Ultrasonic Dog Barking Deterrent (Black)

Amazon.com Price: $39.99 (as of 04/09/2023 23:27 PST- Details)

2-in-1 ultrasonic anti barking device provides a safe and effective solution for dog training and bark control.
25KHZ fixed frequency and 30KHZ variable frequency, ensure that one of them can be used effectively.
Suitable for small medium large dogs.