Connection strengths for each client can be seen under wireless registration. I believe the external LED’s only show strength when acting as a client on a network, but I could be wrong.
Thank you for your reply . I see an inconsistency between the webpage you referred to and the PDF brochure linked to on this same page. In the brochure it states under Extras: Reset switch, Beeper, USB 2.0 port, Voltage monitor, Temperature monitor.