This Anti Dog Barking Device is a humanistic ultrasonic bark control device that helps to control dog excessive and abnormal barking, which will automatically detect dog barking then emitting safe and harmless ultrasonic sound to stop dogs from barking. Bring you a quiet and comfortable rest and learning environment! [ Main Features ] 1. Automatically detecting dog barks and emitting ultrasonic to stop dog barking. Automatically stopping ultrasonic after the dog stops barking. 2. Durable, Waterproof, Anti-Smashing, Sturdy, Weatherproof material. Note: Please take the device home when it rains heavily3. Small, light, easy to install, place, or hung anywhere. 4. Max effective range up to 33 ft away. 5. Fit for most breeds and sizes of dogs. 6. Size: 3.34in 2.83in 3.54in [ How to Use the Stop Dog Barking Tool ]1. Turn on: Press hold on "power" 3s, with 1 short beep sounds and red LED flash. 2. Turn off: Press hold on "power" 3s, with 2 short beep sounds and red LED flash. [ Built-in Lithium Battery: 1500mAh ] 1.Charging : 5 hours 2.Working : 30 days 3.Standby : 60 days [ Packing List] 1 Anti-Bark Device 1 USB Cable 1 Wrist Strap 1 User Manual [ Note ] 1. Not advised for more than 50 pounds dogs. 2. Not advised for Under 6 Months, Over 8 Years Old Dogs. 3. Not advised for Abnormal Hearing, Grumpy or Aggressive Dogs. 4. Not advised for using in the Particularly Noisy Environment. 5. Not advised for using 1 device against 2 or more dogs at once.Easy to Use After-Sales: Our Dog Barking Deterrent Devices only needs to turn the power to work, no need to change the frequency regularly. We provide 12 months warranty and 30 days unconditional return policy. If any issues, please be free to contact us, we will offer FULL REFUND OR REPLACEMENT. Waterproof Durable : The shell of this Dog Bark Stopper with sturdy ABS IPX4 waterproof, anti-smashing, weatherproof, sturdy, which gives the device a longer lifetime and can hang anywhere indoor and outdoor. (Need to take home when it rains heavily). Chargeable Endurance: Bubbacare Anti Bark Device is equipped with a built-in 1500mAh rechargeable lithium battery that supports charging via USB cable. Fully charging only 5 hours can continuously work 30 days. ( Note: the output current is no more than 2A. ). 100 Safe Harmless : The Stop Dog Barking Tool uses high-pitched ultrasonic technology, which will not cause any harm to humans or dogs. But it can grab dogs' attention easily and make dogs no more continuously and excessively dog barking. Automatic Convenient: Compared with the traditional dog training collars, this Anti Dog Barking Device can automatically detect dog barking, emit ultrasonic and stop ultrasonic, which will completely free your hands to stop your dog or neighbor's dog barking.