The side push button has three different sound wavemodes, which are initiated by 22-25KHZ Stable and continuous sound waves Undulating sound waves Sound waves with irregular frequencies After selecting the sound wave mode, please press the launch button, it will directly to send out ultrasonic waves.The animal's hearing will become immune to a certain sound after a long time of adaptation, so multiple sound waves can prevent dogs from being immune to a certain sound wave.

The working distance of PU50 ultrasonic dog bark silencer is 5 meters, which is better for indoor use.

● BEEP sound, you can use it before each use of ultrasound, so that some dogs can be conditioned to reflect, and they will react after hearing the BEEP sound. ● The BEEP mode can combine into your usual dog training instructions. For example, when press BEEP button to call your dog every time, and then you can give a reward. After multiple uses, the BEEP sound will become the sound of calling the dog