Http URL: To configure URL, If HTTP action is chosen.
Open relay: To configure relay to open.
Door status: To show the status of input signal.
AEC Level: AEC(Configurable Acoustic and Line Echo
Cancelers) is used to adjust the echo effect during the
communication. The default value is 700. Increase the level,
the echo control is better.
Photoresistor: The setting is for night vision, when the
surrounding of R27A/C is very dark, infrared LED will turn on
and R27A/C will turn to night mode. Photoresistor value
relates to light intensity and larger value means that light
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