Epson PowerLite 1288 4000-Lumen Full HD 3LCD Projector with Wi-Fi - Manual (Page 43)

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Connecting to an External Computer Monitor
If you connected a computer to the projector's Computer port, you can also connect an external monitor
to the projector. This lets you see your presentation on the external monitor even when the projected
image is not visible.
If you want to output images to an external monitor when the projector is turned off, you need to select
Always On as the A/V Output setting in the projector's Extended menu.
Note: Monitors that use a refresh rate less than 60 Hz may not be able to display images correctly.
1. Make sure your computer is connected to the projector's Computer port. If there are two computer
ports, make sure you use the Computer1 port.
2. Connect the external monitor's cable to your projector's Monitor Out port.
Parent topic: Connecting External Output Devices
Related references
Projector Setup Settings - Extended Menu
Connecting to External Speakers
You can connect the projector to external self-powered speakers and control the volume using the
projector's remote control.
You can also connect the projector to an amplifier with speakers.
If you want to output audio from the external speakers when the projector is turned off, you need to
select
Always On as the A/V Output setting in the projector's Extended menu.
Note: The projector's built-in speaker system is disabled when you connect external speakers.