VTech IS7121-22 - Page 16

Getting started
11
Locating the doorbell
Avoid mounting it to where reections may be caused by sunlight, for example,
opposite to a white wall.
•
Two built-in infrared LEDs are for night vision. Make sure the surrounding light
source is sufcient for infrared operation.
Test at the front door to determine when the infrared LEDs turn on. When they are
in operation, they turn red.
•
Infrared LEDs