What is the tosibox key?

Excuse me, but could you please clarify what exactly the Tosibox key is? I've heard of Tosibox as a secure remote access solution, but I'm not entirely sure what role the key plays within the system. Is it a physical device, a software token, or something else entirely? And how does it contribute to the overall security of the Tosibox solution? I'm quite curious to learn more about its functionality and how it fits into the broader Tosibox ecosystem.