### device | detector:

Lightning detector
* Lightning Detectors watch storms that spawned tornadoes.
* are now common in the Kansas City area.

Motion detector
* Most motion detectors use technology.
* Motion Detectors are an important part of any home or business's security arsenal.
* Some motion detectors have alarms in addition to the lights.
* are available in cute forms that make animal sounds
* go off at night when no one is in the building.
* senses movement in room.

Photoelectric detector
* are better at sensing smoky fires, such as a smoldering mattress.
* respond faster to the large smoke particles created by smoldering fires.
* sound when the smoke is dense enough to deflect a beam of light.
* use a light beam within the detector to sense a fire.

### device | detector:

Smoke detector
* Most smoke detectors have a small button, usually in the center of the outside cover
  - operate on batteries or household current
  - use a nine-volt battery
* Smoke Detectors Buy and install smoke detectors.
* Smoke Detectors Smoke detectors save lives
  - that contain radioactive sources require special disposal methods
* Some smoke detectors contain radioactive material.
* alarm locally in individual rooms.
* alert occupants to a fire - allowing time for escape
  - when a fire is still small and there is still time to escape
* are a very important safety feature provided in residential buildings
  - an important aspect of home fire safety
  - chemoreceptors
  - critical to surviving a night time fire
  - electronic devices that do require eventual replacement
* are essential safety devices for protection against fire deaths and injuries
  - to early detection of a fire
  - everywhere, but still thousands of people die in fires annually
  - extremely effective at preventing fire-related death and injury
  - fire alarm
  - important because many fires smoke and smolder before bursting into flame
  - in every room and are powered by electrical circuits
  - located in apartments
  - potential life saving devices
* are sensitive to airborne particles including cigarette smoke and hair spray
  - dust as well as smoke
  - simple to install and save lives
* can only save lives if they are in good working condition
  - save lives only if they are working properly
* can save lives, but only if properly installed and maintained
  - they are properly installed and maintained
  - smell smoke
* come in many styles and two different types.
* contain a small amount of radioactive material
  - small sources
* differ in several ways.
* do their job using one of two technologies, ionization and photoelectronic.
* give earlier warning of a fire, providing more time to escape.
* have a life of approximately ten years
  - wide range of features
* help the home occupants by giving early warning so they can escape.
* identify deadly smoke and warn occupants to leave.
* look for the reduction in visibility caused by sooty gases.
* make thoughtful gifts for friends and relatives.
* perform a life-saving function in the event of fire.
* provide an early warning sign that there fire
  - some warning of uncontrolled fires
  - the best early warning of a fire
* react to fire byproducts.
* respond to particles of combustion.
* run on batteries in most cases.
* save lives and are extremely effective when families are sleeping
  - every day, but only if they are properly installed and maintained
  - lives, prevent injuries and minimize property damage
* sense abnormal amounts of smoke or invisible combustion gases in the air
  - the presence of smoke
* sound alerts for potential fire hazards
  - an alarm at the first trace of smoke
* use a radioactive element called americium.
* work by sensing rising smoke from a fire and sounding an alarm
  - the rising smoke from a fire and sounding a piercing alarm
  - very small smoke particles in the air