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The alert system is intended to allow government and the emergency services to send a text alert to mobile phones in a situation where there is perceived to be an immediate risk to life. Mobile users will receive an alert accompanied by a siren-like noise, they must acknowledge in order to use the phone's other features.
In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
4. Click the Sounds tab. 5. Click Customize My Sounds. 6. Search for a sound or select a category from the "All" menu at the top-right. 7. Optionally, click the Preview button to play a sound. 8. Click Apply to choose a sound.
Learn more about the AOL app and download it from the App Store. The AOL app is available for iOS devices running iOS 12 or newer. 1. Open the App Store on your device. 2. Tap the Search icon. 3. Type "AOL" in the search field. 4. Tap Search. 5. Next to AOL: News Email Weather Video, tap Get. 6. Enter your Touch ID or Apple ID, if prompted. 7 ...
Alerts can be geo-targeted, when only phones in a defined geographical area are set to receive an alert. When an alert is received, a notification is shown in a unique format and a dedicated sound is played even if the phone is set to silent: a two-tone attention sound ⓘ of 853 Hz and 960 Hz sine waves. [4]
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The four-minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992. The name derived from the approximate length of time from the point at which a Soviet nuclear missile attack against the United Kingdom could be confirmed and the impact of those missiles on their targets.