When powered up the TravelSafe alarm will automatically perform a self-test. If the test where passed, all three LED´s will indicate that, by flashing 3 times, furthermore a beep will sound . In the other case, if an error was encountered, the red LED will indicate the type of error. This is done by flashing red LED x times according to the number of the error. (If more than one error is present - only the first error encountered is indicated on the LED). 1 x flash – failure on button 2 x flash – failure on low voltage (battery) 3 x flash – LED failure (red, green, yellow LED) 4 x flash – failure on light sensor in smoke chamber 5 x flash – failure on system voltage 6 x flash – motion sensor failure