Specification: Item: Ultrasonic Dog Repeller Anti Barking Trainer  Material: Plastic Power :9 volt battery  (not included) Size: 11x6.5x3.5cm Package include: 1 x Ultrasonic Dog Repeller Anti Barking Trainer 
Feature: 1, Used to prevent dog attacks, issue ultrasound to repel the dog .  2, In normal situation, it can be used as a normal flashlight to illuminate at night.  3, Ultrasonic wave reaches up to 125dB. Audible to dogs but not to human.  4, Effectively target animals up to 15 feet away.  5, Can also be used as dog training device. 
Important Note: 1, If you find that it doesn't work well in stopping dog from barking, Please change the batteries timely.  2, When the dogs stay quiet, please don't use the product to irritate them. 3, Use the ultrasonic bark control device within effective distance.
The effect is not obvious under the following condition: 1, the dog knows its owner will not hurt itself . 2, When a dog stays with its owner . 3, the dog is well-trained .