Features: The maximums effective distance is 50feet, so you only need to fix in area where the dog often moving, and you donot have to worry. The dog barking deterrents can be place on trees, dog houses, and wall. This dog barking control device only ultrasonic, and then the dog becomes aware of this behavior, reduces barking, and train the dog's behavior. It is a humanized automatic antibarking device that doesnot require manual intervention. Different dog breeds have different perception of frequency and sensitivity. This ultrasonic antibarking device have 4 frequencies (15KHZ-30KHZ) and 4 sensitivity, which can adapt to different dogs aged 6 months to 8 years old. This dog barking device charging using a USB charging cable (included) and on various devices. A single charge can work normally for 4-7 days, with a standbys time of up to 90 days. This dog Barking control device have IPX4 waterproof rating, allowing it to be safely place outdoors regardless of weather conditions. The small size structure and waterproof ABS make the dog Barking muffler wear resistant and will not waste your money. Specifications: Material:ABS Battery Capacity:1200mAh Interfaces:USB Waterproof:IPX4 Color:Green,Black Package Includes: 1Set Dog Barking Deterrents Device note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.