ISO Japanese variant of the Turbo Booster Plus

[Mathius]

Guys, don't kill me now. I forgot what the PC Engine model of the Turbo Booster Plus is called. Aside from my rustiness on terminology I am interested in acquiring one of these. Doesn't have to be boxed nor mint. Just a gamer's unit. Thanks, fellers. 

[majors]

You thinking "AV Booster"? There is also two "Backup Boosters" but the second one doesn't have AV out.

[Mathius]

You thinking "AV Booster"? There is also two "Backup Boosters" but the second one doesn't have AV out.

Yeah I'm looking for the one with both battery backup and AV out.

*Edit* Thanks for kickstarting my memory.