The Patton Model FAK-2981-ST is a complete bundled package for Fire Alarm annunciation applications and comes with all the devices and kit needed for an installation. The package includes the FOI-2981 Optical Transmitter with 2 Audio Inputs and 1 Doorbell Input, the FOI-4982 Optical Receiver with 2 Audio Outputs (8 Ohm and 600 Ohm) and the ADP-2981 Amplified Speaker with Strobe. The package is shipped complete with the PSQ-2910 Power Supply and WMA-3002 Wall Mount Adapter for FOI-2981 and other accessories.