The TP-Link OC200 measures 3.9 x 3.9 x 1.0 inches (10.0 x 9.8 x 2.5cm), so it’s quite compact, although a bit less than the Ubiquiti Cloud Key, but still only a bit larger than a Raspberry Pi. Unfortunately, the OC200 is not magnetic and neither is its bigger sibling, the OC300 and that’s something that I really appreciated with the SkyKey because I could simply attach it to the side of a rack or on a switch and not bother with it too much.