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This item is for changing the setting on your TK20/TK22 board. By default, ALL TK22 series boards are set to the 'Heavy Tank' setting.
If you have a TAMIYA battle unit(TBU), or a Heng-Leog battle unit(HBU), you do not need this programming line. Only users with no IR battle need this for changing settings on the TK20/TK22.
5P connector with IR receiver & Red LED indicator, and a 2.54mm-pitch Jumper
For more information on the Clark TK series of tank control boards, please visit the Official Clark Model Information Page