Microphone is required to set off alarm automaticly. If you don't hava a microphone on your computer, you can use the test button toset off the alarm. You must download the project for this to work. Alarm LED Colours: Off - Alarm is not set Yellow - Alarm is set Red - Alarm is sounding Test LED Colours: Off - Test off On (yellow) alarm is testing Reset LED Colours: Off - Not resetting On (yellow) - Reset in progress Alert (!) LED Colours; Off - Alarm is off. Yellow - Alarm is testing Red - Alarm is sounding Turn off alarm: Just tap 'Reset' (silence) to turn off the alarm...