Feature: 1. Control and Train Dogs: Our ultrasonic barking control devices provide a safe and effective solution for dog training and barking control. It can effectively train your dog to stop barking, digging, eating unsafe food, fighting and other unnecessary behaviors. 2. Ease of Use: When you press and hold the button of the ultrasonic barking control device, it emits ultrasonic waves that only dogs can hear. When the device is working and emitting ultrasonic waves, the LED indicator lights up green. 3. Ergonomic: The anti bark control is ergonomically designed for easy portability and fits perfectly in your hand, making it ideal for indoor or outdoor use. Unique speakers up to 25 feet make it easier to train them to behave well in public and keep them from unsafe food. 4. Scientific Way: Ultrasonic anti bark devices are friendly and safe for both humans and dogs. Humanized design, completely free your dog from cruel electric shock collars. Consistency and patience are key when training your dog, and remember to reward your furry friend with treats. 5. Suitable for Dogs of All Sizes: The average hearing frequency range of humans is 20Hz‑20KHz, and dogs can hear a wider range from 15Hz to 120KHz. This ultrasonic barking control emits 24KHz ultrasonic waves, so the sound will not affect humans, but can attract the attention of dogs. Specification: Item Type: Ultrasonic Bark Control Device Material: ABS Size: Approx. 3.5 x 11cm/1.4 x 4.3in Battery Type: Lithium Battery Battery Capacity: 200mAh (Included) Waterproof Grade: IPX2 Charging Time: Fully Charged within 5 Hours Working Time: 15 Days (According to Actual Usage) Effective Range: Up to 25ft Ultrasonic Frequency at 24KHz. Package List: 1 x Ultrasonic Bark Control Device1 x English Manual1 x Lanyard1 x Charging Cable Note: 1. Not recommended for puppies (less than 4.5 lbs).2. This device is not intended to prevent dog attacks.3. May not be as effective for older dogs or dogs with hearing problems.4. Different dog breeds may respond differently to ultrasonic. For best results, use this product as a training aid, along with other tools or commands. Be patient during this training process.5. This device can be used for barking deterrent training dogs. Maximum operating range is 25 feet6. To avoid desensitizing your dog, only turn on the device during unwanted barking.7. The device should face the dog and be within the dog's range (up to 25 feet)This device cannot be used to defend against ferocious wild dogs.8. Do not immerse the machine in water or any other liquid. Avoid exposing your device to very cold or very hot temperatures (below 0 degrees Celsius or above 45 degrees Celsius). Extreme temperatures can cause equipment to deform and reduce its lifespan.9. Please keep an arm's length away from people's ears to avoid hearing damage.This device is not a toy. Keep away from children. Swallowing small parts can cause suffocation or serious injury.10. This device is only used for dog training and driving. Do not attempt to use it for any purpose not described in this manual.11. Please allow some errors due to manual measurement.