TP-Link TL-SC3171 User Manual page 61

Note:
1) You can set motion detection on motion detection page (Please go to "Setting → Advance
→Motion detection → Setting"). For more details, you can check Section 7.7.
2) Motion Detection works only when the MPEG4 function is On and the Cropping is set to Off.
Use Alarm Buffer: Select Use alarm buffer when you forward the image and video of before
and after the alarm detection (pre-alarm, post-alarm). If you do not select it, only the image of
the moment of the alarm detection is forwarded. Click Alarm buffer to display the Alarm buffer
setting menu.
56