Hmm.
i do believe a "silent" guitar is a nylon / steel-strung instrument which has an on-board pickup and pre-amp and an out-put jack for the user to plug their headphones into for "silent" practising lah.
TGM has a copy of the yamaha model, but IMO it doesn't seem to come close in terms of aesthetics. It looks cobbled together with pre-existing components, and not exactly high-quality or even mid-quality parts.