Aftermarket Turn Signal Switch

I came across a thread regarding aftermarket switches, but can not seem to find it now. So forgive me but I will have to ask something that has been answered a few times over I am sure.....

Located a switch online for $25~ but it has an extra plug. Are the $125 any better than the $25 switch? Any ideas on the extra plug?

0d1f9173bba941a4a0ff01990eca0d19_490.jpg