A voice alarm notification device of a fire alarm system, comprising: a network port for receiving an alarm notification signal; an audio file library in which the audio files include audio voice message files; a speaker; a processor unit connected to the network port for processing an alarm notification signal and for selecting one of the audio files from the library to be played through the speaker; and a Bluetooth module for establishing a Bluetooth communication link to the voice alarm notification device, via which link an audio voice file can be received. The device is arranged to add the audio voice file received via the Bluetooth communication link to the library so as to be available for selection by the processor unit when it receives an alarm notification signal.