This is a projection lens. Do not look through the lens while an image is projected.
Main Unit - Front
TOP
Lens cover 
The lens cover opens/closes when the power supply is turned on/off. (LINK)
For 
, attach the lens cover when the unit is not in use.
Remote Sensor (front)
Please aim the remote control at this area when using it.
There is also a remote sensor at the rear.
Indicator
Refer to Indicator Display on the Main UnitLINK.
Exhaust vent
Warm air is discharged to cool down the internal temperature.
Do not block the vents.