Steren CCTV-940 Manual De Instrucciones página 57

Then, you can set next parameters:
Channel 1 – 4 sensitivity
As user you can configure the motion sensitivity for each channel. Press
Sel / Edit to modify the parameter.
Channel 1 – 4 area set
This option allows you to select the active area, which it helps to activate
the alarm. The image will be divided in 144 blocks (12x12), if the area is
active, you will see a transparent block, if the area is not active, you will
see a shadow in the block. Use Up ( Down ( Forward / Backward to select
a block and set it up, pressing Sel / Edit button.
ENGLISH-21