This product looks like a panda, the ultrasonic bark plug can be hung on the tree, anywhere in the house or yard, on the table or anywhere else. When the Ultrasonic Bark Stop detects excessive barking, it detects the barking and activates the component. At this point, the product will emit a safe high-pitched ultrasonic wave that can be heard by dogs but not by humans. The dog is stimulated by sound, becomes uncomfortable and stops barking. Designed for indoor and outdoor use, the Outdoor Ultrasonic Bark Stopper is durable and waterproof. There are 3 levels of sensitivity (effective range of 15 meters) and a test level. Built-in 1500mAh rechargeable lithium battery Excessive barking can have a negative effect on you and your neighbors. Outdoor ultrasonic peelers are effective in stopping barking, are safe and effective, and are suitable for dogs of all breeds and sizes.