Anti-Barking Device, 15-50ft Dog Bark Control with 4 Adjustable Levels, Rechargeable Ultrasonic Tool to Stop Barking Behavior [Bark Stopper for All Types of Dogs]: Anti-barking device using the latest ultrasonic technology, suitable for dogs of all breeds and sizes. The bark controller automatically emits a high-pitched tone that only dogs can hear. Automatically senses the sound of the dog and once the dog stops barking, the ultrasonic barking controller will automatically stop emitting ultrasonic waves. [Safe for Dogs and People] The indoor dog bark stopper has no electric shock, no pungent odor, and no squeaks, safe for pets and harmless to humans, the bark stopper automatically emits ultrasonic waves to prevent dogs from barking, perfect when you leave Create a calm environment for your family and neighbors by asking your dog to be quiet when walking your dog. If the dog is hearing-impaired or aggressive, the device may not work as expected. [Stop Dogs from Baking Indoor and Outdoor] Dog Baking Control trains your dog's behavior by simply turning the knob. Great for keeping neighbor and homeless dogs from barking outside. [Efficient and Rechargeable USB Battery] This rechargeable anti-barking device is easy to use. A 3-hour charge gives you 30 days of use, saving you endless hassle and battery investment. No need to install batteries, it works right out of the box. (It is recommended to fully charge before use, the effect will be better) [IP65 Waterproof Protection] Our anti-barking device can be easily hung on a tree, wall or fence post and works even on windy and rainy days. Note: The battery of the dog barking stopper may be consumed during transportation, please fully charge it before use. Not using the product for a long time can also cause damage to the battery. Please fully charge the battery before storing the product, which can effectively extend the service life of the product. Packing list: 1 anti-barking device notes: 1. Due to differences in monitors and light effects, the actual color of the item may be slightly different from the color shown in the picture. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm)