StarGate, The Next Generation in Automation.

A - StarGate, brains of the system.

B - IRXpander allows infared control of stereo, TV, etc...

C - 70 volt line audio amplifier to power the house speakers.

D - Garage speaker.

E - Video modulator. This device takes the video signal from the front door camera and puts on channel 21.

F - Temperature sensor interface.

G - RF amplifer for the TV antenna, it has 20db of gain.

And don't forget the wires-wires-wires it takes to hook all this up. Don't under estimate the amount of wiring you need!