Vizio E400i-B2 - User Manual - Manual (Page 13)

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Controls and Connections
Ethernet - Connect Ethernet cable from home network.
Coaxial - Connect coaxial cable from cable, satellite, or antenna.
Optical Audio Out - Connect optical/SPDIF audio device, such as
home audio receiver.
Stereo Audio Out - Connect RCA audio device, such as sound bar.
HDMI - Connect HDMI device.
Component/Composite - Connect component or composite device.
USB - Connect USB thumb drive to play photo, music, or video.
HDMI - Connect HDMI device.
BACK PANEL
Note: The image shown here is for illustrative purposes only and may be subject to change.
The actual number of ports and their locations may vary, depending on the model.