The product is a set of two ultrasonic anti-bark devices designed to silence dogs' barking by emitting high-frequency sounds that disrupt the dogs' vocal cords. These devices are rechargeable and come with a wire for easy power supply. They are weatherproof, making them suitable for outdoor use during various weather conditions. The ultrasonic frequency helps to effectively train dogs to stop barking without causing harm or discomfort to the animals.
eBay