Photoresistor: The setting is for night vision, when the
surrounding of R20 series is very dark, infrared LED will turn
on and R20 will turn to night mode. Photoresistor value relates
to light intensity and larger value means that light intensity is
smaller. User can configure the upper and lower bound and
when photoresistor value is larger than upper bound, infrared
LED will turn on. As contrast, when photoresistor value is
smaller than lower bound, infrared LED will turn off and device
turns to normal mode.
Tamper Alarm: R20 series integrates internal gravity sensor
for the own security, and after enabling Tamper Alarm, if the
gravity of R20 series changes dramatically, the phone will
alarm. Gravity Sensor Threshold stands for sensitivity of
sensor.
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