- dog barking control device will automatically emit ultrasonic sounds that are sensitive to dogs. Once the dog stops barking, the bark control device will automatically stop emitting the ultrasonic sounds. The sensitive microphones can automatically detect dog barking up to 50 feet away (also works on your neighbors dogs).- Durable and waterproof design so you can install it outdoors, in your home, etc. with included mounting hardware.- (4) Four Sensitivity and Frequency adjustable levels, so you can adjust to any level you want. Different dogs may be sensitive to ultrasound of different frequency bands. Please test different frequency bands to obtain the best results.Level 1, Frequency: 15 KHz, Sensitivity: Low, Effective Range: 15 feetLevel 2, Frequency: 20 KHz, Sensitivity: Low, Effective Range: 30 feetLevel 3, Frequency: 30 KHz, Sensitivity: Medium, Effective Range: 50 feetLevel 4, Frequency: 15-30 KHz, Sensitivity: High, Effective Range: 15-50 feet- Using an ultrasonic bark control device can effectively prevent barking by yours or your neighbor's dog. The device can aid in creating a more peaceful environment.- ultrasonic dog bark deterrent uses high-pitched ultrasonic sound technology. Ultrasonic sound is above the hearing range of humans, but it will draw the attention of dogs. It is safe for humans and dogs.-USB powered, no batteries neededThe device can be charged in just 3 hours and will work continuously for 30 days once fully charged.- The dog deterrent device is not applicable to the following situations: aggressive dogs, noisy surroundings, hearing impaired dogs, dogs under 6 months or over 8 years, or noisy surroundings caused by music, etc.Packing list:1 pc (1 Stop Barker)