Favorite portable bottle warmer

I’m due in November and just found this group and have SO many questions (first time mom) so expect to see a lot of posts from me. 😭 sorry in advance lol.

What’s your favorite portable bottle warmer?

Did your baby prefer room temp breast milk since it’s not warmed up out of the breast? Did they start to prefer warmer milk after you started warming the milk up and they not want to drink from the breast anymore?

These might be stupid questions but I have no idea what I’m doing at this point. 😂 thank you!