Effective Training: Our gentle pet bark control device provides a safe and effective solution to stop dogs from barking. Bark Stoppers can effectively train your dog to stop unwanted behaviors such as barking, fighting, digging, eating dangerous food, fighting, etc. Lightweight Design: our dog training equipment is designed to be wearable and portable. You can train your dog anywhere and keep it in a bag or pocket, perfect for indoor and outdoor use. The compact device fits perfectly in the hand. It also prevents other dogs from approaching you while jogging, walking or running. Safe to use: sound frequencies between 25 and 30 kHz have been proven to be safe for hearing dogs and will not cause bodily harm. With an average hearing range of 20Hz to 20kHz, the Ultrasonic Bark Deterrent emits 24kHz ultrasound, the sound safely grabs your dog's attention and you won't hear it Field of application: The anti-bark device is effective within a radius of 5 m. We no longer need to prepare AA batteries. Built-in 1200mAh battery, fully charged in 5 hours, supports 15 days of normal use NOTE: Bark controls are available for different dog breeds and sizes. But it is not recommended for dogs under 6 months of age as it may impair their hearing development and is not effective for aggressive dogs or dogs with hearing problems. For best results, do not use in noisy environments