With 4 ultrasound heads. to form a conditioned reflex. The principle of a bark stop device is that when the dog barks, ultrasound will work. 【3 Adjustable Ultrasonic Levels 】Features three adjustable ultrasonic levels (10-16KHz for small dogs;. ).
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Ultrasonic Outdoor Anti Barking Device 4 Adjustable Level 50 Ft Neighbors Dog Silencer Waterproof Safe for Pets and People
Aliexpress UK
First, you can drive the dog to produce super-strong ultrasound, which can make the dog escape quickly. People can't hear it. Dogs and cats can hear it. Third, this product has three files, the first gear is the role of flashlight lighting; the second gear is to press and hold the lighting.
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Pet Dog Repeller Automatic Ultrasonic Bark Control Dog training Device
Aliexpress UK
双头含包装尺寸：14.1cm 6.2cm 3cm. 单头含包装尺寸：13.8cm 5cm 3cm.
eBay
Pet Dog Repeller Ultrasonic Dog Training Device Rechargeable Anti Dog Bark Stop Barking Deterrent Device With LED Flashlight
Aliexpress UK
Features: -It emits safe sound waves (25-30KHz) to attract your dog's attention and prevent bad behavior. -The maximum applicable distance is 10m, and the optimal distance is 5m (ultrasonic waves cannot penetrate obstacles). -Built-in 800mAh rechargeable lithium-ion battery, can be used for up to 60 days per charge. -With low/medium/high frequency mode, this ultrasonic wave will not cause harm to dogs, but can effectively stop dogs from barking and aggressive behavior. -Equipped with two high-brightness LED lights, you can turn on the spotlight with one button, allowing you to walk safely and worry-free even in the dark. .
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Ultrasonic Anti Barking Device Anti-disturbing Puppy Barking Stopper Anti-noise Rechargeable Deterrent Sound Trainer Tools
Aliexpress UK
Exceptional Longevity: Featuring a sturdy, long-lasting design, this anti barking device is crafted from high-quality materials that are both durable and wear-resistant. It is based on the ultrasonic principle that dogs can hear but humans can't.
eBay
AURAL PET TRAINER. Alternatively, use as a training tool to reduce your dogs barking and improve behaviour. Uses high frequency sound to repel unfriendly dogs and prevent unwanted barking. Humane, safe, and effective pet trainer.
eBay
Features: Adjustable sensitivity: Equipped with 8 sensitivity levels, allowing you to customize it according to your pet's needs. It can effectively reduce annoying barking of dogs at night or when you are away, ensuring peace and tranquility. Waterproof design: With IP67 waterproof rating, it ensures your pet can enjoy bathing, swimming, playing in the rain without damaging the device. Durable battery: Built-in 300mAh battery, only needs 2 hours of USB charging to last 15-20 days. Equipped with an intuitive large LED color interface that displays battery level and low battery alerts for an enhanced user experience. Multi functional adaptation: .
eBay
Slide the dog barking deterrent function and switch to the "Train" site. The anti barking device will emit low-intensity ultrasound to help you correct excessive barking, fighting, and bad behavior.
eBay