Please recommend a cordless oral irrigator!

I have a corded Waterpik, but it's too noisy to use on a marble surface in the early morning, so I'm looking to buy a cordless one. However, it's much more expensive than the corded one, haha. Oh, is it not suitable for places like this? I'm thinking about the Aquapik, so please let me know the reviews from those who have used it!