The [1]Ambi Head is a complete system that comes with a quartz illuminator, AmbiStand, light hood, and two spare lamps. In case of a power failure, the [2]trouble light will be activated but the keypad buzzer won't sound. Moreover, [3]a sensor in the alarm system is indicated by the corresponding zone lights flashing on a LED keypad or written messages. To access the system, you need to use one of the 33 access codes.