The alarm feature is an easy and subtle way for the driver to signal to the dispatch that he/she is under distress. An unnoticeable click from the driver triggers an alarm to be activated in dispatch, letting your dispatchers know that this driver might be in a threatening situation.
More information about the alarm feature can be found in our user manual: http://www.manula.com/manuals/taxicaller-nordic-ab/driver-app/1/en/topic/alarm-feature