Online shopping input "noisy upstairs, prevent noisy upstairs, end the evil neighbor artifact" and other words, you can choose some small vibrators. The principle of the vibrator is similar to the manual of the mobile phone, but the power is amplified many times, which can be controlled by the remote control and the mobile APP. Vibration frequency and vibration duration can be controlled at will; This method is like the "sounds of nature" opened after 12 pm, which can make people have a mental breakdown and ensure that they will have psychological shadows after using it, and they will tremble when they hear the vibration sound.
It has been said for a long time that a distant relative is better than a close neighbor. If there is no need to do this, we have to use some "cheap" means just for some wonderful flowers; Of course, harmonious neighborhood relations need everyone's joint efforts.