D-Link DCS-5230 User Manual page 37

Section 3 - Configuration
The red grid on the right indicates an area that has been selected for motion
detection.
When motion is detected, the LIVE VIDEO page will display a blinking orange
motion video icon like the one below.
No Motion Motion
The motion notification will continue to blink as long as motion is detected.
If no additional motion is detected, it will return to its original state after eight
seconds.
D-Link DCS-5230 User Manual 37