What Do the Blue LED Light and the Green LED Light on the Front of Plugable UD-3900 Indicate?

Last Update: October 27th, 2020
Article ID: 698604

The blue LED indicates that the Plugable UD-3900 is being powered by its power adapter. The green LED lights up and stays steady when a  device is connected to any of the six USB ports within the dock. If no devices are connected to the USB ports within the Plugable UD-3900, the green LED only lights up for around five seconds when the dock itself is connected to the upstream host system.