ViewSonic Pro8600 User Manual page 14

Connect an audio output from video equipment or computer to this jack.
15. Audio 3 (L/R)
Connect an audio output from video equipment to this jack.
16. Video
Connect composite video output from video equipment to this jack.
17. Computer in 2
Connect image input signal (analog RGB or component) to this jack.
18. Computer in 1
Connect image input signal (analog RGB or component) to this jack.
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