[ICOM] Does IC-T7H have 2-wire or 3-wire earphone jack?

[JimR]

I am participating in a public service event, and want to use a standard 
set of earphones instead of a speaker mic.  I want to be sure I make the 
right connection into the radio.  (Google really isn't any help in this 
case.  Most sites listed are just trying to sell to me, and I have seen 
both 2-wire and 3-wire from them).

Thanks,

-- 
73 de Jim, KD1YV