Emerson CKD9918 Owner's Manual page 20

Headphone (PHONES) Jack
This unit includes a 3.5mm PHONES (headphone) jack on the front panel. This
allows you to connect a set of stereo headphones (not included) for private
listening without disturbing others. When headphones are connected, the
built-in speakers are automatically disconnected.
IMPORTANT! When using stereo headphones always set the volume control
to a low level before you put on the headphones. Then put on the
headphones and gradually adjust the volume control to the desired level.
Remember that prolonged listening with headphones or ear buds at high
volume levels may eventually cause hearing loss
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