I've only used my own transponder to save money, by not paying for theirs. But if you want to you can use theirs, it does work going through tolls.
They worked for me in the past. But if you have your own I would suggest using that one.
I used my own personal transponders when going through tolls so that the rental company does not charge any extra fees for tolls.
They work if you paid for it when you signed your contract. $3.50
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