Vidikron 40 40ET ユーザーズマニュアル

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Installation
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Installation
Remote Control 
Notes on Batteries
Make sure that the battery polarities are correct when installing the batteries.
Do not mix an old battery with a new one or different types of batteries.
If you will not use the remote control for a long time, remove the batteries to avoid damage from battery leakage. 
Notes on Remote Control Operation
Make sure that there is nothing obstructing the infrared beam between the remote control and the IR receiver on the projector.
The useable range is between 3m/ 9.8 feet (from the front of the projector) and 4m/ 13.1 feet (from the top of the projector) within a 
30 degree horizontal angle and 15 degree vertical angle.
Push down on the tab and lift to open the cover. Install the two AAA 
batteries with the correct polarity, then close the cover.