● Why AVCB01 USB Video Grabber's LED are dead?,FAQ - AVCB01 USB2.0 Video Capture
● Why AVCB01 USB Video Grabber's LED are dead?
AVCB01 macOS - Why my AVCB01 USB Video Grabber's LED are dead?

For the AVCB01's USB Video Grabber, there are LED lights on the Device. 
Windows OS - The LED lights on only if there are data transferred.Otherwise, the LED won't be lit.
macOS - The LED lights won't be lit.