Samsung 400BX User Manual page 27

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Preparations
Remote Control Reception Range
Use the remote control within 7m to 10m from the sensor on the product at an angle of 30˚ from the left
and right.
Store used batteries out of reach of children and recycle.
Do not use a new and used battery together. Replace both batteries at the same time.
Remove batteries when the remote control is not to be used for an extended period of time.
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1 Preparations