Safe & Friendly Anti Barking Device for Dogs Indoor - The anti barking device for dogs indoor adopt ultrasound technology to gently discourage excessive barking without harm. The test shows that this dog bark deterrent device is completely harmless to human, animals and plants. You don't have to worry about its impact on you at all Up To 33 Feet Effective Range - The anti barking device for dogs indoor can detect the barking of dogs within 33 feet. When it senses the barking of dogs, the anti barking device will send out ultrasonic waves to stop the barking of dogs. Anti barking devices for dogs indoor has four control modes. 15KHZ: Suitable for large dogs; 20KHZ: Suitable for naughty dogs; 25KHZ: Suitable for medium dogs; 30KHZ: Suitable for small dogs IPX45 Waterproof&Rechargeable - Built-in 2000mAH battery supports charging via USB cable. It can be used for 30 days after charging for 5 hours. All-weather to create a quiet environment for you. The waterproof level is IPX45, and even in rainy days, our dog barking device can work normally Advanced Ultrasonic Barking Control - Our new dog bark deterrent device will automatically sense the barking of dogs and send out ultrasonic waves to stop dogs from barking. Equipped with a remote control, we can also use infrared remote control to regulate Anti Barking Device for Dogs Indoor - Anti barking devices are effective for most breeds and sizes of dogs. Some dogs may be afraid or dislike ultrasonic waves and will not stop barking at the beginning. When using the indoor barking control device for the first time, please reserve 2 weeks of training time. It is equipped with a lanyard, so you can take it with you