Epson PowerLite 685W 3500-Lumen WXGA Ultra-Short Throw 3LCD Projector - Manual (Page 71)

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You see a screen like this:
1 Power button control
2 Selects the Computer port source
3 Selects Video and HDMI port sources
4 Freeze button control
5 A/V Mute button control
6 Page up and Page down button controls
7 Searches for sources
8 Selects the network source
9 Selects the USB Display or USB device source
10 Volume button controls