New Anti Barking Device Auto Ultrasonic Dog Bark Control Devices 4 Mode 10 Frequency 50FT Range Outdoor Indoor Waterproof Bark Box UPGRADED LCD SCREEN: visualize the battery level of the anti bark device, and it will make BB warning sound when the battery level is low. The barker has a lock screen function, short press the key to lock the screen after turning on the barker. In the lock screen state of the barker can work normally, just the screen does not light up, more battery saving, tested, the barker can work up to 10000and times if using 9V 6LR61 alkaline batteries (not included). 4 SENSITIVITY MODES: Auto, high, medium, low mode, high sensitivity mode represents the dog barking control device can release ultrasonic waves when sensing lower barking sound auto mode the anti bark device can automatically adjust the sensitivity. The newly upgraded automatic mode makes the anti barking device more intelligent and more effective in managing dog behavior. 0-9 FREQUENCIES: in the three standard modes the frequency is fixed and can be selected by human in the automatic mode, the dog bark deterrent device can automatically select the appropriate frequency each time when receiving the barking signal, the frequency is not fixed. Different dogs react to ultrasonic waves at different frequencies, so for best results, we recommend testing your dog's reaction at different frequencies and then choosing the most suitable one. SAFE AND HARMLESS ULTRASONIC BARKER BOX: The ultrasonic waves emitted by the stop barking dog devices are aimed at your dog, when the anti bark device detects barking it emits a specific frequency to which the dog resists, over time a smart dog will realize that it is its barking that triggers the anti dog barking device, thus reducing the frequency of barking. It is worth mentioning that this frequency is almost completely inaudible to the human ear and will not disturb your life. WATERPROOF BARKER BOX: The dog barking silencer prevents water splashing and can be used outdoors, but is not recommended for extreme weather. The maximum effective distance is 50 feet, and it is recommended that they be placed in an area where your dog spends a lot of time. Dog barking deterrent device can be used as a behavioral training tool for your dog and stop neighbors dog from barking. There is no bark.