2025 NEW Version with New Tech - Safe and Gentle for Both Animals and Humans: Our ultrasonic dog bark silencer has undergone thorough testing to ensure it is entirely safe for people, animals, and plants. Thanks to its precise sonic frequency, it operates in a way that may go unnoticed by the human ear. It typically takes up to two weeks for the dog to associate the subtle sound with a signal, helping in training them to reduce excessive barking, cooperating with New tech, and it filters irrelevant noises such as chatting, door shutting and enhanced the accuracy of detecting your dogs voiceprint to prevent false triggers 3 Adjustable Intensity Settings - Anti barking device has 3 different intensity settings: Low, Med and High, Med and High level are set with the new function of frequency conversion, which releases irregular ultrasounds that prevents dogs being immune to fixed ultrasound frequency. Mode 1: Low Range (up to 25 feet) ; Mode 2: Medium Range (up to 50 feet) , Use Mode 3: High Range (up to 75 Ft). Its more effective to stop dogs from barking Up to 75 ft. Effective Distance - Dog bark control device can automatically detect dog barking up to 75 feet away. Then, the anti barking device will automatically emit ultrasonic sounds that only dogs can hear Suitable for All-Sized Dogs - The dog barking deterrent is suitable for dogs of all sizes. The bark control device adopted the ultrasonic technology to grab dogs attention. It works automatically without having your dog wear it or pressing any buttons Rechargeable Dog Bark Deterrent Device-Our device is equipped with a built-in 750 mAh rechargeable battery, providing up to 15 days of use on a single 2-3 hour charge. It comes with a USB charging cable that is compatible with computer ports, portable power banks, and standard USB power adapters.