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2. The Mosquito - Wikipedia

   en.wikipedia.org/wiki/The_Mosquito

   The sound was made into a mobile phone ringtone, which could not be heard by teachers if the phone rang during a class. [13] Mobile phone speakers are capable of producing frequencies above 20 kHz. [14] This ringtone became informally known as "Teen Buzz" [15] or "the Mosquito ringtone" and has since been sold commercially.

3. Ringtone - Wikipedia

   en.wikipedia.org/wiki/Ringtone

   A ringtone maker is an application that converts a user chosen song or other audio file for use as a ringtone of a mobile phone. The ringtone file is installed in the mobile phone either by direct cable connection, Bluetooth, text messaging, or e-mail. On many websites, users may create ringtones from digital music or audio.

4. Ringing tone - Wikipedia

   en.wikipedia.org/wiki/Ringing_tone

   In many cases, the cadence consists of a double ring of 0.4 seconds separated by 0.2 seconds, and a two second pause after which the cadence repeats (0.4s on, 0.2 s off, 0.4 s on, 2 s off). In many cases the tone is a combination of 400 Hz and 450 Hz sine waves.

5. Ringing (telephony) - Wikipedia

   en.wikipedia.org/wiki/Ringing_(telephony)

   Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell. It is therefore also commonly referred to as power ringing , to distinguish it from another signal, audible ringing, or ringing tone , which is sent to the originating caller to indicate ...

6. Call-progress tone - Wikipedia

   en.wikipedia.org/wiki/Call-progress_tone

   The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]

7. Dial tone - Wikipedia

   en.wikipedia.org/wiki/Dial_tone

   The Precise Tone Plan for the North American Numbering Plan of the US, Canada, and various Caribbean nations specifies a combination of two tones (350 Hz and 440 Hz) which, when mixed, creates a beat frequency of 90 Hz. The UK dial tone is similar, but combines 350 Hz and 450 Hz tones instead, creating a 100 Hz beat frequency.

8. Outlawed anti-drone radio jammers are being marketed on ... - AOL

   www.aol.com/news/anti-drone-companies-market...

   Several online retailers and drone technology companies are marketing the sale of radio frequency jammers as drone deterrence or privacy tools, sidestepping federal laws that prohibit such devices ...

9. The 14 Amazons - Wikipedia

   en.wikipedia.org/wiki/The_14_Amazons

   The 14 Amazons is a 1972 Hong Kong wuxia film directed by Cheng Kang and produced by the Shaw Brothers Studio. The award-winning film featured a predominantly female cast. The award-winning film featured a predominantly female cast.