1.NEW TECHNOLOGY & NO MORE DOG BARKING：The bark Control Device emits an ultrasonic sound wave that effectively trains your dog to stop excessive, noisy barking. Stop the annoying barking of a neighbor's dog. 2.CUTE MINI PAW DESIGN: Size is 3.7 inch * 4 inch * 0.9 inch. The new dog paw design is small size, easy to carry, very easy to put into your pocket. Designed for easy hanging/mounting on a tree, wall or fence post to stop any dogs barking 3.HUMAN AND PET 100% SAFE:The bark Control Safe to your dogs of any size, other pets, plants, and of course yourself and your loved ones.The ultrasonic high-pitch frequency sound that is emitted from the device is inaudible to humans yet safe and effective training tool for your dog or the neighbors dog to disrupt the barking patterns. 4.SWITCH WITH 3 LEVELS OF OPERATION：Low Sensitivity - Short range detection (up to 15 feet), Medium Sensitivity - (up to 30 feet), High Sensitivity - (up to 50 feet). NOTE: Does not work on deaf or hearing impaired dogs. 5.TWO POWER SUPPLY METHODS：The Dogpaw Shape Outdoor Bark Control utilizes a replaceable 9-volt battery (not included),and an average battery life of 2 months.; You can use rechargeable 9V battery installed in the product, it can use the USB cable to charge the battery and direct power supply.