Vizio E420i-B0 - User Manual - Manual (Page 12)

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Controls and Connections
BaCk Panel
ethernet - Connect an Ethernet cable from home network.
Coaxial - Connect coaxial cable from cable, satellite, or antenna.
optical audio out - Connect an optical/SPDIF audio device, such as
home audio receiver.
stereo audio out - Connect an RCA audio device, such as sound bar.
hdmi - Connect an HDMI device.
Component/Composite - Connect a component or composite device.
usB - Connect a USB thumb drive to play photos, music, or videos.
hdmi - Connect an HDMI device.