This transformer is way too hot for Ring Doorbell Pro. The output of this transformer at the doorbell was 26.5v and it fried it. I returned the Ring Doorbell Pro to Costco and bought their Doorbell 2 (in warehouse) bc I didn't feel like extending my weekend doorbell replacement project for another week. Before installing new doorbell, I bought a 3 output regular bell transformer from big warehouse hardware store. Used the 16v output and measured 18.5v at the bell. It powered it flawlessly and my project is done.
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