When i was young and in brasil i had a cousing who had some kind of wireless sega console that was hand held and let me play games on the tv... umm it could of been an adon for the gamegear but i doubt it and i have vague memories that it might of worked on batteries. Kinda reminded me of a megajet thing but without the wires!
Isn't this the Super Master System Compact? http://www.sega-brasil.com.br/especiais/catalogos/smssuperc-alex-frente.jpg PD
Ha there we go did this thing come out anywhere else? EDIT: http://assembler.roarvgm.com/Master_System_Compact/master_system_compact.html
It looks a lot like my Atari 2600 "Wonderboy" clone (which can also broadcast it signal via an antenna) :smt043
There are two of these on MercadoLivre (a brasilian auction website) right now. One is the regular one picture in this post and the other one is the pink version:
