Whynter AFR-300 - Manual (Page 9)

9
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The remote control is loaded with a CR2025 battery in advance. Before use,
please pull off the battery insulating plastic.
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Aim the emitter of the remote control to receiver in the front of the air purifier.
The maximum signal transmission distance is approximately 15 feet.
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Please change the battery if the signal is weak or if the remote control is
non-responsive.