We just put the sunpass on the windscreen when we pick up the car - and off we go! We have had it now for about 8 years - one thing to remember - check the battery!! A couple of years ago I realised that it hadn't 'beeped' going through two or three tolls - when we took it to Walgreens - sure enough - the battery was dead! It's just like a watch battery - a couple of $$ and we were as good as new! and the tolls we went through were deducted when we were back live! We also have the payments coming out of one of our UK accounts, NOT our USA account - no problems there either! The transponder is registered to the owner - not the car! Best $25 I have ever spent.
Jean