### device | instrument | measuring device | timepiece | clock:

Alarm
* Some alarms also dial when they are armed or disarmed.
* are a means to implement timing sequences
  - devices that monitor systems over time and issue alerts
  - most people s first line of defense against fire
* causes danger.
* includes balance wheels
  - sections
* is devices
  - fear
  - signals
* is used for alarm
  - rings
  - warns
  - weapons
* sounds when door or window is opened
  - gas hazard develops

Alarm clock
* Some alarm clocks have both a vibrating pad and a flashing light
  - play music
* are also avaiable
  - located in homes
* are used for awakens
* have bells.

### device | instrument | measuring device | timepiece | clock | alarm:

Burglar alarm
* Some burglar alarms have automatic calling capability to notify alarm activation.
* are more important to thwart vandals and arsonists than they are to catch burglars.
* is alarm.
* work on the principle that noise is an effective deterrent.

Car alarm
* Most car alarms are false alarms
  - have a panic button which sets off the alarm when pushed
* Some car alarms have a flashing red light on the dash which indicates there is an alarm.
  - electronic devices

Car horn
* Most car horns make sound.
* are horns
  - part of cars
* is alarm

Security alarm
* are intrusion alarms, tamper alarms, or panic alarms.
* monitor all interior and immediate interior areas for breakage, and movement.

### device | instrument | measuring device | timepiece | clock | alarm:

Smoke alarm
* Make sure children know what a smoke alarm is.
* Many smoke alarms contain radioactive americium, for example
* Smoke Alarms Make sure children know what a smoke alarm is.
* Some smoke alarms contain mercury, which is extremely dangerous even in small amounts.
* are a family's best defense against fire
  - smart way to alert one to a fire
  - extremely effective at preventing fire-related death and injury
  - important all the time and especially during and after a storm
  - inexpensive effective devices that alert people when fire occurs
  - tools that can tell if there is smoke in the air
* become less sensitive over time.
* can cut the risk of dying in a fire by half.
* designed for deaf people are quite different.
* do save lives, and, in most states, are required by law in private homes
* have a limited life span.
  - battery powereds
  - created by manufactures
  - located in buildings
  - made of components
* lose their sensitivity over time.
* provide an early warning signal for escape from fire.
* provides a warning in case of a fire.
* save lives if installed properly and maintained.
* sense abnormal amounts of smoke or invisible combustion gases in the air.
* sounds when no smoke is visible.

Antique clock
* are superior to new clocks mechanically.
* is an art that ranges in style and beauty.

### device | instrument | measuring device | timepiece | clock:

Digital clock
* are clocks
  - more accurate than mechanical ones
* cause a similar warping of reality.
* display the time in periodically changing digits on a digital display.
* give exact time in numerals.
* rely on electronic circuitry, instead of gears.
* use numbers to show the time.
* work by measuring the vibrations of quartz crystals when charged with electricity.
+ Clock, Clock displays, Digital clocks
  * Digital clocks use numbers to show the time. LCDs and LEDs are common for digital clocks. Digital clocks are usually smaller and easier to both use and read than analog clocks but they can also be made much larger. New digital clocks can even correct themselves using the internet or radio signals
  - Keeping time:
  * Digital clocks work by measuring the vibrations of quartz crystals when charged with electricity. The vibration frequency of the crystal does not change

Logical clock
* are sequence counters maintained by each site, used to order messages.
* take monotonically increasing values.