The Slice system has a footprint of 6.5-by-6.5-inch (17 by 17 cm), much smaller than a typical conference phone and smaller than a Mac Mini. Without any modules it's about 1.4 inches/4 cm high and weighs around 2.3 pounds/1.1 kg.
The Collaboration Cover isn't a module, it's a $33 configuration option that adds touch phone controls for connecting and disconnecting calls, adjusting volume and muting. It also adds improved noise cancellation for the microphone. The controls only appear when the system's on, and they glow, which you can't tell here.
To turn the Slice into a high-quality conference phone, you snap on the $109 Audio Cover which adds a a set of Bang & Olufsen speakers. Without it, everything sounds kind of tinny, but if you use a headset that shouldn't be an issue.
From left to right, that's a power button; charging connector; Ethernet connector; USB-C 3.1 connection; two USB-A ports (with a wireless dongle in one); DisplayPort and HDMI connectors; and Kensington lock slot. The Audio Cover (bottom) also has a separate Kensington slot.