You'll need a 1/4" male to 1/8" female adapter (or smaller) to use the dinky phones. Radio Shack has them. But, while you're there, check out some of their inexpensive stereo headphones first. I used a pair of theirs for a couple years before I got my Black Widows.
Anything by DetectorPro (i.e. Gray Ghost, Rattler, Black Widow) is a good investment.