PCB with AT90USB162 and BitWizard-standaard 20 pins IO connector (with 16 programmable IOs)
The headers don't come pre-soldered to the board, but multiple versions are included, so you can assamble your board just the way you like it.

Power and programming through USB.

Datasheets:
AT90USB162
Documentation for the complete PCB
Contents:

1 USB-Multio 2.1 (headers not mounted)
1 2x10 header
1 2x3 headers
1 1x2 header
2 1x10 female headers
2 1x10 headers with round pins