🙀Are you feeling powerless and angry that dog suddenly barking for no reason?😠🐶This Anti Barking Devices can automatically detect dog barking then emit safe and harmless ultrasonic sounds to stop dogs from barking. Choosing our stop dog barking tool to provide you with a quiet and comfortable rest and learning environment and a healthy and obedient dog.🐶[ 3 Levels of Frequencies ]I Level: 15KHZ-30KHZ suit for 2/more dogs large/naughty dogs light noisy environment.II Level: 20KHZ suit for middle/ docile dog normal hearing dog quiet environment.III Level: 30KHZ suit for puppies and dogs sensitive to ultrasound🔋[ Built-in Lithium Battery: 1800mAh ]1. Charging : 5 hours2. Working: 30-45 days3. Standby: 3 moths🎁[ Packing List]1*Anti Dog Barking Device1*User Manual1*USB Cable❗❗❗[ Note ]1. Not advised for Under 6 Months Over 8 Years Old Dogs.2. Not advised for use in the Particularly Noisy Environment.3. Not advised for Abnormal Hearing Fierce Wild Grumpy or Aggressive Dogs.4.. Repeated training and appropriate rewards are necessary to achieve the desired result.💯[ Warranty ]💐We provide 1-year warranty and 30 days unconditional return policy. If you have any issues please be free to contact us we will offer FULL REFUND OR REPLACEMENT.