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Designed for outdoor use, the Outdoor Ultrasonic Bark Stopper is durable and waterproof. There are 3 sensitivity levels (effective range is 4.5.9 to 15.24 meters) and a test level. The outdoor ultrasonic bark stopper has a power indicator, which can be set to "Off" to protect the battery when you're away. Effective for most dogsThe device is suitable for most breeds and sizes, but not deaf or deaf dogs. Some dogs may be afraid or dislike the sound of ultrasound, and they won't stop barking at first. Please allow up to 2 weeks for training. Safe Bark StopperSound waves are harmless to pets. If the dog is hard of hearing or aggressive, the device may not work as expected. It is not recommended to use one device against two or more barking dogs at the same time. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery quantity: (according to the main image)