There are 3 of them, they change the source for each TV. I have 3 DVD players (including the Xbox) and any one can watch from any source. (source selector)
Da inferno
Here is my set up
# Kenwood DNX7100
# 2 CLARION 7" HEADREST
# XBOX 360
# CLARION DVD PLAYER
# 2 CLARION 10" WOOFERS
# METRIK AMP
# Pyle power inverter