2-in-1 training and anti-barking device: Deterrent mode: emit a higher intensity ultrasonic sound while the flashlight flashes as a warning to prevent other dogs from approaching you. Training mode: emit a lower intensity ultrasound to aid daily dog training, e.g.To stop excessive barking, fighting, biting and correcting other undesirable behaviors correct Works with Dogs of All Sizes - The Ultrasonic Bark Control Device generates an ultrasonic sound in the dogs hearing range from 15 Hz to 120 kHz. Rechargeable Dog Bark Defense Control: The anti-bark device can be used for 15 days after 5 hours of charging, when green light indicates it is fully charged, when red light means low power. It can be charged in laptops, batteries, power outlets and in the car, which is very convenient. Portable and easy to use: When you press the dog buttons on the ultrasonic devices to deter dog barking, an ultrasonic sound is emitted. The LED indicator lights up green when the device is working and emitting ultrasound. Press the dog buttons for communication for more than 10 seconds, the device will turn off automatically. Safe for your dogs of all sizes, other pets, plants, and of course yourself and your loved ones. Stop excessive, loud dog barking by emitting an ultrasonic sound to silence the dog. More effective than the old version deterrent and waterproof.