Description: 【Quad-core Automatic Anti-bark Device】Utilizes advanced ultrasonic technology, effectively suppressing excessive barking through four ultrasonic transmitters. It automatically activates upon detecting barking and automatically deactivates when barking stops, providing a safe and humane training solution. 【3-level Adjustable Ultrasonic Intensity】Equipped with three adjustable ultrasonic intensity levels: 15kHz-30kHz for general irregular ultrasonic waves; 20kHz for small/docile dogs; 30kHz for playful/large dogs. Recommended for dogs aged 6 months to 8 years. Testing different intensity levels is recommended for optimal results. .
eBay