General description This black portable ultrasonic dog repeller is designed to safely deter barking and unwanted behaviors in dogs. It operates without harmful chemicals, making it safe for pets, other animals, and the environment. Technical specifications Ultrasonic frequency: 20-25 kHz Effective range: up to 6 m (19.7 ft) Battery: 1000 mA rechargeable polymer battery LED flashlight included Size: portable and compact Usage Stops your dog from barking Prevents neighbor's dogs from barking Teaches puppies not to bark Useful during camping trips to control barking Other information Can also be used for dog training, outdoor work, travel, shopping, and dog patrol security.