1. Safe and Effective AntiDog Barking EquipmentThis product optimizes the shortcomings of the old equipment, using hightech ultrasonic technology to protect your dog's , while preventing aggression or excessive barking caused by unfamiliar environment and emotional agitation. Ultrasound has been experimentally tested, gentle and effective, and will not have any effects on the dog's body. 2. Up to 33Ft RangeWith a range of up to 33 feet, our Dog Barking Control Device covers a wide area, making it suitable for both indoor and outdoor use. Whether you're at home or out in the yard, this device provides reliable bark control. 3. Adjustable ModesThere are three adjustable modes for barking control: high, medium, and low. The highfrequency setting (15KHZ 30KHZ) is suitable for larger or more energetic dogs, while the medium (20KHZ) and low (30KHZ) settings are suitable for gentler or smaller breeds. It has an effective range of 33FT, providing extensive coverage in various environments. 4. Dog SilencerDesigned to withstand the elements, our Dog Barking Control Device is waterproof, ensuring durability and reliable performance in any weather condition. Rain or shine, you can trust this device to help control your dog's barking.