alarm device
type of device that alerts people to a dangerous condition by means of visual, audible or sensitive signals, using sensors or measurements already observed and sometimes imposed and controled
air raid alert
alarm signal to warn the population in case of an air raid
Vibrating alert
feature of communication devices that notify users by vibration
Division bell
bell rung in or around a parliament to signal a division
Code amber alert
supervisory radio message for trains and station staff
robbery alarm
form of an alarm after a robbery
silent alarm
type of alarm
school bell
sound making device designed to communicate with students
error message
message displayed on a monitor screen or printout indicating that an incorrect instruction has been given or that there is an error resulting from faulty software or hardware
banknote contact
former method of detecting cashbox theft
electric bell
mechanical bell that functions by means of an electromagnet
car alarm
device installed in a vehicle in an attempt to discourage theft