Ultrasonic Ringtones這個網站可以測試自己可以聽到多高的頻率的聲音，我的結果如下所示，有興趣的作作看吧。
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You are the typical teenager
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You can hear the frequency of the mosquito teen repellent – but probably not for much longer!
The highest pitched ultrasonic mosquito ringtone that I can hear is 17.7kHz |
| Find out which ringtones you can hear! |
[敗家] Nikon AF-S 16-85mm f/3.5-5.6G VR
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[敗家] Quick Strap 快速背帶
[敗家] Nikon D7000 (附A16N2 Liveview對焦問題)
[敗家] Acer S243HL [敗家] Nikon AF-S 16-85mm f/3.5-5.6G VR [敗家] Commodore 戰車9909霧面硬殼行李箱 [敗家] i-gotU GT-600 GPS旅行軌跡紀錄器 [敗家] Quick Strap 快速背帶 [敗家] Nikon D7000 (附A16N2 Liveview對焦問題) [敗家] Acer S243HLBad Behavior has blocked 100 access attempts in the last 7 days.
