Animal Friendly Bark Control DeviceThis ultrasonic bark control device works by sending out a stable frequency sound that only dogs can hear, allowing dogs to avoid annoying voices that cause barking. Anti-bark device is harmless to dogs' hearing, perfect for creating a quiet room for dog lovers, stopping unwanted behavior such as barking, digging, fighting, etc. Effective on Dogs of All SizesThe ultrasonic dog barking deterrent with 3 levels adjustable sensitivity and frequency (15-30KHz for big naughty dogs; 20KHz for docile dogs; 30Khz for small dogs) easily deal with different barking dogs . Adjusting frequency for each week can keep the training effect. The wide 33ft (10m) control range is suitable for stopping the neighbor's dog from barking at you and your family. Easy to UseThis rechargeable dog bark control device with indicator light can be used without any effort. The light will flash blue when working; Red light when the sonic anti-bark device is triggered by a bark; the red light will flash in low power. The 3.7V 1500mAh USB charging battery can be used for 30 days, saving you the hassle and cost of batteries. Outdoor and indoor use The anti devices -humane bark IP4 rainproof function and portable hook are suitable for outdoor use, easy to hang on trees, walls or fence posts. But if it rains a lot, it is better to take it back to help protect the equipment prolong service life. Small ultrasonic dog training devices can be set more 1.5m indoors, which can make them more effective . Royal ServiceOur dog bark box comes with 1 charging cable, 1 dog training whistle and 2 screws for easy installation. If you have any questions regarding our anti-bark devices, please do not hesitate to contact us. We will respond and solve your problem within 24 hours. This anti bark device will stop working when the battery is exhausted