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2. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   An 1860s-era siren. [ 2 ] A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. There are two general types: mechanical and electronic.

3. Fire alarm notification appliance - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_notification...

   European Siren for fire detection system. A fire alarm notification appliance is an active fire protection component of a fire alarm system. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible appliances have been in use longer than any other ...

4. Ring (company) - Wikipedia

   en.wikipedia.org/wiki/Ring_(company)

   Ring LLC. Ring LLC is a manufacturer of home security and smart home devices owned by Amazon. It manufactures a titular line of smart doorbells, home security cameras, and alarm systems. It also operates Neighbors, a social network that allows users to discuss local safety and security issues, and share footage captured with Ring products.

5. Earthquake early warning system - Wikipedia

   en.wikipedia.org/.../Earthquake_early_warning_system

   Earthquake early warning system. An animation detailing how earthquake warning systems work: When P waves are detected, the readings are analyzed immediately, and, if needed, the warning information is distributed to advanced users and cell phones, radio, television, sirens, and PA systems / fire alarm systems before the arrival of S waves.

6. SimpliSafe - Wikipedia

   en.wikipedia.org/wiki/SimpliSafe

   The wireless system also runs on lithium batteries, and can't be disabled by cutting the user's power. [32] As a standalone product, SimpliSafe systems function as a noise-only alarm system, emitting an 85-decibel siren. [33]

7. Car alarm - Wikipedia

   en.wikipedia.org/wiki/Car_alarm

   Car alarm. A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both. Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary ...