Here's a
link on the various ways you can get an iPass transponder. The transponder belongs to the Tollway Authority. You put down a refundable deposit on it. You'll also need to setup an account with $20 or $30 in it which will go towards tolls. Total cost will be something like $30 or $40. When you use up the money set aside for tolls it will replenish automatically with a credit card.