Brinno PHV MAC - Manual (Page 18)

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Low light enhancement
Auto - detect switch
If the lighting conditions outside your door are poor,
turning on the Low Light Switch will improve the image.
To enable the motion activation feature of the PHV MAC turn the
Detect switch to ON. Now anytime someone approaches your door
the PHVMAC will wake up and store their photos.
For better battery life you can switch auto detect off when you are home.
Low light enhancement & Auto - detect switch