1. Innovative anti-barking system: this device uses advanced 2024 technology to automatically detect dog barking and two ultrasonic speakers to effectively control barking. The emitted ultrasonic frequencies are safe for pets and comfortable for humans. Combine this device with a simple bark training method and positive reinforcement for optimal results. 2. Three ultrasonic frequency levels: the anti-barking device offers three selectable frequency modes: the low frequency 23 kHz is suitable for puppies or sensitive dogs; the medium frequency 25 kHz is suitable for average or training dogs; high frequency 23/27 kHz is an automatic frequency conversion mode that is suitable for large or stubborn dogs. Choose the appropriate mode according to the specific situation of the dog. 3. Detection range up to 50 feet: with a range of up to 50 feet, this anti-barking device can detect your dog's barking and automatically trigger ultrasonic waves. Perfect for use in the living area or in the garden, the device can cover a large area without having to move it. Compared to a handheld bark stopper, this device can work 24 hours a day to calm the dog. 4. Durable and waterproof construction: the device is rechargeable via a USB port and can remain in standby mode for up to 30 days after 4 hours charging time or work for 5 to 7 days with continuous operation. Thanks to its IPX4 waterproof and robust construction, it is ideal for a variety of outdoor environments such as house entrances, yards, fences and so on. Use scenarios: - Use in the living room to reduce barking when visitors arrive or household noises trigger barking. - Place in the garden or near a fence to deter outdoor barking from passersby or neighboring activity. - Use during training sessions to reinforce quiet behavior with positive reinforcement.