Description: This is an anti-bark training device that features 100% safe to humans and harmless to dogs. Not only is it portable, but also it is easy to operate. Parameters: Frequency: 25 KHz Sound pressure: 125 dB Max current: 130 mA Powered by: 9V battery (not included) Available distance: within 20 feet How To Use Pet Trainer: 1. Point your pet trainer directly at the dog or cat, always use an outstretched arm from a distance of approx 6 feet away (effective within the distance of up to approx, 20 feet). 2. Press the button for 1 or 2 seconds, then immediately give a verbal command, such as""stop""quiet""""off"". The ultrasonic wave of Stop Barking Stall is stronger than the ultrasonic wave of Training Stall and can stop dog from bad behaviors quickly. 3. Repeat step one and two until your pet responds to your commands. Every time when the dog stops bad behaviors, remember to praise or reward your little friend. Notes : If you find that it doesn't work well in stopping dog from barking, please change the batteries timely. We recommend using rechargeable battery. When the dogs stay quiet, please dont use the product to irritate them. Use the ultrasonic bark control device within effective distance. The battery is not included in the package, please buy it by yourself. Dog repeller can work on most dogs, but sometimes it won't work on those giant dogs. List: 1 x Ultrasonic dog trainer 1 x User manual