Manual call point

Manual fire alarm activation is done by using a pull station or call point. ... Manual call point is used to initiate an alarm signal. It can be manual alarm system or part of automatic alarm system. Under normal conditions push button will be in the depressed condition. In the case of fire when the glass cover is broken, the push button will be released by the spring action and will actuate an alarm at the control panel through its switching contacts. In addition to this, there will be an LED indicator on the monitor module for visual indication to locate the call point easily. [Manual fire alarm activation. Wikipedia]