If you have a Folsom, ErosTek, PES or other brand of power box with a lead wire that uses a 3.5mm male input lead into the power box and want to use a set of leads with a 2.5mm input jack, this is the adapter you want.  It converts the 3.5mm input jack from the power box to a 2.5mm female socket allowing you to use any Rimba or Zeus products that have a "hard-wired" 2.5mm male input jack.

These adapters may come in handy especially if you have a couple different power units.