Kensington LD5400T is a discontinued, large and heavy Thunderbolt 3 dock. After powering it on, at first there were issues with video output that made me think it’s defective. After some testing, I found it has below limitations but still usable:

  1. Its TB-3 /USB-C port cannot output to USB-C monitors and needs a USB-C to HDMI or DisplayPort adapter to connect to monitors. (Instead, the Elgato TB3 dock I’m also using can directly output to USB-C monitors, using a USB-C to USB-C cable).
  2. It has one DisplayPort port (and no HDMI port), and it doesn’t support DisplayPort to HDMI adapting cables. (Again, the Elgato TB3 dock can outputs to HDMI port through such adapter cable).

So even this dock has the visually same ports as the Elgato (which has also been discontinued, but it’s light and small and has worked perfectly for two years), remember above limitations before you think it’s defective.