Dell u2410 - Manual (Page 38)

Attaching the Soundbar(Optional)
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1 Working from the rear of the monitor, attach Soundbar by aligning the two slots with the two tabs along the bottom rear of the monitor.
2 Slide the Soundbar to the left until it snaps into place.
3 Connect the Soundbar with the DC power connector.
4 Insert the mini stereo plug from the rear of the Soundbar into the computer's audio output jack.
CAUTION: Do not use with any device other than Dell Soundbar
NOTE: Monitor DC power connector +12 V DC output is for Dell Soundbar, that does not have built-in AC adapter, eg Dell AX510.