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2. Driveway alarm - Wikipedia

   en.wikipedia.org/wiki/Driveway_alarm

   A driveway alarm is a device that is designed to detect people or vehicles entering a property via the driveway.A driveway alarm system is often integrated as a component of a system which automatically performs a task or alerts home owners of an unexpected intruder or visitor.

3. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Driveway alarm systems can be combined with most security and automation systems. They are designed to alert residents to unexpected visitors, intruders, or deliveries arriving at the property. Types of driveway sensors include magnetic and infrared motion sensors. Driveway alarms can be found in both hard-wired and wireless systems.

4. Early warning system - Wikipedia

   en.wikipedia.org/wiki/Early_warning_system

   An early warning system is a warning system that can be implemented as a chain of information communication systems and comprises sensors, event detection and decision subsystems for early identification of hazards. They work together to forecast and signal disturbances that adversely affect the stability of the physical world, providing time ...

5. Warning system - Wikipedia

   en.wikipedia.org/wiki/Warning_system

   A fire alarm that warns people if a building is on fire. Alberta Emergency Alert; Alberta Emergency Public Warning System (replaced by Alberta Emergency Alert) [4] Alert Ready (Canada) Automatic Warning System; Child abduction alert system; Dam safety system; Earthquake warning system; Emergency Alert System (EAS) (United States) Famine Early ...

6. Voice-activated radio-dispatched alarm - Wikipedia

   en.wikipedia.org/wiki/Voice-activated_radio...

   A voice-activated radio-dispatched alarm, or VARDA-alarm, is a type of burglar alarm that, when activated or "tripped", broadcasts the type of the alarm and the transmitter location over the local police radio frequency using a pre-recorded audio message. [1] In 1968, the voice-activated radio dispatched alarm (VARDA), was invented.

7. Emergency Alert System - Wikipedia

   en.wikipedia.org/wiki/Emergency_Alert_System

   The National Public Warning System, also known as the Primary Entry Point (PEP) stations, is a network of 77 radio stations that are, in coordination with FEMA, used to originate emergency alert and warning information to the public before, during, and after incidents and disasters.