Humans have not mastered forcefield technology, unlike the Kingdom of Frog they do not have passive forcefields that are always on, in their ships and personnel. Human scientists have developed techniques allowing for a forcefield to be projected a very short time using fusion power cells.
The forcefield belt is a miniatures version of human forcefield technology. Whilst after turning the forcefield on the user is only protected for a short time.
Human forcefields expend a lot of energy in a short time causing the user to be rendered almost invulnerable for a short period of time to most weapon attacks.
