** USB Key Board(Compact Type) / Cable Switch **
You can get detailed information below pdf_file
http://gahueyn.netii.net/CNC/Eng_Use...e_keyboard.pdf
or pls..Visit to ebay page.
CNC Mach3 USB Key Board(Compact Type) Cable Switch - eBay (item 180687925228 end time Jul-26-11 22:28:07 PDT)