Elmo Network Pan-Tilt-Zoom Camera PTC-201CIP - Manual (Page 8)

Point the infrared emitting window of the wireless remote controller at the infrared sensor
of the Camera, located at the front, and the rear panel, and select the desired function.
Receivable range
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2. WIRELESS REMOTE CONTROLLER
Note: The infrared sensors may receive the infrared rays only within a narrower
receivable range or may not receive them at all depending on the ambient
environment, such as being placed under the sunlight or near an inverter
fluorescent lamp. In such case, relocate the installation place of the
receiving side or block off the sunlight.