Safer Ultrasonic Dog Training & Behavior Aids: Dog barking control devices emits an ultrasound of 20~25 KHZ, which exceeds the range of human hearing but can easily lead to the dog's attention without hurting your dog like a dog whistle,safe to correct unwanted behavior and stop dog barking or prevent eating unsafe food. 2-in-1 Training & Anti Barking Device: Deterrent mode: Emit a higher intensity ultrasonic sound while the flashlight flashes as a warning to drive the fierce dog away. Training mode: Emit a lower intensity ultrasonic sound to assist in daily dog training such as stop excessive barking, fighting, biting, and correct other unwanted behaviors. Powerful Ultrasonic Speakers Control devices: Dog training-bark control device uses speaker that reach up to 25 ft to deter unfriendly dogs. And its portable design makes you can use the ultrasonic dog bark control devices to train your dog or carry it around to drive away. Ultra Battery Life and Rechargeable: Stop barking dog devices for dogs is rechargeable with a standard USB included in the box. Taking this portable dog barking deterrent device with you, Longest for up to 6 months of use without charging it again. Only need 4-5 hours to fully charge. Standby time is up to 6 months.