Training + driving one is enough,You can train your dog at home and drive away stray dogs outdoors Ultra-Sonic Anti-Barking Deterrent,After pressing, high-frequency sound waves are emitted to stimulate the dog, making the dog feel surprised, thus interrupting its bad behavior. Continuous use will gradually improve the dog's bad behavior and develop good habits. Suitable for dogs of all sizes,The frequency range that human ears can hear is between 20Hz-20KHz, while dogs can hear a higher frequency range of 15Hz-120KHz. This product releases 22KHz-25KHz ultrasonic waves, which have no effect on humans. Three ultrasound modes,Continuous ultrasonic/intermittent ultrasonic/variable frequency ultrasonic release, intuitive button operation, solve the problem of no effect on pets in a single mode. Built-in lighting flashlight,In variable frequency trigger mode, the flash light and ultrasonic repellent can quickly repel ferocious dogs. In addition, a separate lighting button is set up, which can also be used for lighting or outdoor SOS rescue. Hign-concerned Chemical:None Battery: 2000mAh Item Type:Bark Deterrents Feature:Ultrasonic with LED Flashlight Colour: A black Material:plastic Package Contents: 1 * Dog Barking Control Device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.