Epson 100" EpiqVision Ultra LS500 4000-Lumen Pixel-Shift 4K UHD 3LCD Laser Projector TV System with 100" Screen (White Projector) - Manual (Page 38)

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4. Connect the stereo mini-jack end of the cable to your projector's Audio Out port.
Parent topic: Projector Connections
Installing Batteries in the Remote Control
The remote control uses two AAA manganese or alkaline batteries that came with the projector.
Caution: Use only the type of batteries specified in this manual. Do not install batteries of different types,
or mix new and old batteries.
Note: Your remote may look different but the steps are the same.
1. Remove the battery cover.