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(1)The teacher can’t hear the ringtone
(2)Input 2006-07-12071502
(3)The ringtone on the cell phone, which can only be heard by teenagers, is spreading silently This service, called Teen Teen Bell, is a ringtone designed based on the fact that hearing is poor from the late 20s, so you can’t hear high-frequency sounds above 8,000 hertz
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(1)Home > Latest Articles
(2)High frequency pipso that only teenagers can listen to
(3)Prevention of late-night toilet flights with Riro
(4)Installation of high-frequency sound speakers in 8 public toilets in Goyang Police Station
(5)Goyang = Yonhap News Reporter Shim Min-kyu = Goyang Police Station announced on the 30th that it has installed high-frequency sound speakers with beeping in eight public toilets to prevent juvenile delinquency crimes in late-night toilets
Sixteen years ago, you used a ringtone that you couldn’t hear
Now use that sound to target teenagers!
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(1)Pepper Doctor 355 ml 2023-05-302253 121570
(2)Best 1
(3)Is it a mosquito? = Move 3
(4)Wilton 2023-05-31074128
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(1)Assistant 14