Space duel Pcb pic what is that add on?

billybob2236

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What is this add on part on this pcb?

http://www.ebay.com/itm/SPACE-DUEL-...543?pt=LH_DefaultDomain_0&hash=item256982cfef

$%28KGrHqV,%21hcE1iPF9FrrBNoSRkJoZw%7E%7E_3.JPG
 
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