LG SPD75YA - Rear Panel Connections

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a
DC IN Plug in the AC adapter with the product.
b
HDMI IN Plug in an HDMI cable to connect an external device to the
product.
c
HDMI OUT (TV eARC/ARC) Plug in an HDMI cable to connect the TV to the product.
d
OPTICAL IN Plug in an optical cable to connect the TV to the product.
e
USB port Plug in a USB storage device to play music with the product.