Ultrasonic dog repeller: produces very powerful ultrasounds. When the dog hears the ultrasonic sound, it will become uncomfortable and therefore away from people. People can’t hear it. Dog training equipment: it can effectively stimulate the dog’s nervous system, so that it can be guided by the owner, there are infrared lights, you can let the dog follow, you can train your pet companionship through your personal hobbies. Dimensions: 13.5 x 5.5cm Portable: Comes with a lanyard, convenient to carry anywhere you need, such as jogging or walking, cycling, park and so on. Easy to use: open the battery cover first, then put in 1 x 9V battery (not included), turn on the switch and it can work well, they can also be used as a flashlight if needed. /li>