Pet-Friendly & Automatic Stop Dog Barking Device No irritating smell and shock, No Beep voice, safe for dogs and humans. Our dog barking control device applies the updated dog bark sensor, only working when detected dog's Barking. With this automatic anti barking device for dogs, you not only can create a silent environment for families and neighbors but also train your dogs to behave well. Anti barking device for all sizes and breeds of dogs The dog barking control device with 4 adjustable modes stops different dogs from barking. "T" mode for testing the bark detector and sonic transmitter. "1" mode is low sensitivity and short-range, perfect for use indoors for small and gentle dog bark control. "2" mode is used in big houses and gardens to stop docile dog barking, and "3" mode is the highest level for use in outdoors to stop neighbor's dog or aggressive dog barking. Extantsive effective Range The highest level can send the effective sound to stop dogs around 50ft barking, perfect for stopping homeless dogs from barking around the home. 2 sonic transmitters enhance the stop barking effect, better than one transmitter of other brands. Placing the barking box face to barking dogs, the barking control effect more obvious. Waterproof and Long standby timeOur anti barking device for dogs with a lanyard and house-shaped IPX6 waterproof design, is easy to hang on trees, walls, or fence posts to stop dog barking near your house. The dog barking deterrent device comes with a 9 Volt high-capacity battery making it standby for 60 days. Saving your time on endless charging and the cost of electricity fees. East to UseThis anti barking device for dogs with an LED Indicator will flash green 1 time per 5 seconds on standby, light red means the dog bark control device on working and flashing red means the battery is low. Any problem with our anti barking device, please feel free to contact us. We will solve and reply within 24 hours.