MetroCon

MetroCon is a 25-pin connector developed by Theorysonic. It was first introduced in April 1996 and its used for charging and syncing data and files (USB 1.1 and 2.0) to older TheoryPhone devices prior to TheoryPhone X, Portosic Digital devices prior to sixth generation, first generation Portosic Touch, Portosic Mini prior to fourth generation, Portosic MC prior to fifth generation, TheoryPDA (1997 and later) devices, and TheoryPDA Style. It was first released in 1996 in black while it was released in white in 2002 and discontinued and replaced by faster 10-pin USB 2.0-based XCI charging and syncing connector that was introduced in 2006.