Check the listing for details. Ultrasonic Dog Bark Deterrent Devices Anti Barking Control Training Rechargeable. Condition: New. Listed at 29.99 USD. Effective Dog Barking Deterrent Device: This dog bark deterrent device can attract the attention of dogs and correct their bad behaviors, such as barking, digging, chewing, scratching, biting, and climbing furniture, rapidly in 1 second. It is safe and effective for dogs. Fixed & Flexible Ultrasonic Frequencies: Our dog barking deterrent device emits a fixed ultrasonic frequency of 25KHz. Moreover, the ultrasonic dog bark deterrent can also emit a flexible ultrasonic frequency in the range of 20 ~ 30KHz, and different frequencies have different effects on different dogs. LED Flashlight Feature: The anti - dog barking device is equipped with a powerful LED flashlight, which ensures visibility and safety during nighttime walks or outdoor activities with your dog.