Features: [UPGRADED DOG TRAINING AND BEHAVIOR AID TOOL]: Utilizing advanced ultra technology, this anti-barking device automatically emits a high-pitched tone that only dogs can hear. It senses barking and activates the ultra sound, stopping automatically when the dog stops barking. [SUITABLE FOR VARIOUS SIZES AND BREEDS]: The device offers four sensitivity levels to suit different environments and dog sizes. The detection range and sensitivity can be adjusted accordingly. Level 1 is the least sensitive, while Level 4 is the most sensitive. [DESIGNED FOR SAFE USE]: This barking control device does not use electric shocks, emits no odors, and produces no loud beeps. It is designed to be safe for pets and harmless to humans. The ultra waves help discourage barking, promoting a quieter environment for you, your family, and neighbors. Effectiveness may vary for dogs with hearing difficulties or aggressive behavior. [USB RECHARGEABLE DESIGN]: The device is rechargeable via USB and features a power indicator. A 5-hour charge provides up to 30 days of typical use, eliminating the need for disposable batteries. Ready to use out of the box. (Recommended to fully charge before first use for optimal performance) [INDOOR AND OUTDOOR USE]: Effective up to 32 feet, this anti-barking device offers reliable performance in various settings. It allows hands-free operation, making it easier to manage barking behavior. Suitable for use at home or during outdoor activities to help reduce unwanted barking.