Video Doorbell Pro 2 Transformer Polarity

Hi all Bought the Doorbell Pro 2 with hardwired transformer, and I am nearly ready to fit it. I have installed the Ring Transformer in its own enclosure, I note its a DC output on the unit, however, no mention is made of connection polarity at the actual doorbell in any of the instructions, and I cannot see polarity marked on the doorbell either. Can anyone confirm if the polarity matters as I don't really want to blow up an expensive video doorbell by connecting it incorrectly.