If you get a Pixel Slate, buy this too.

If you’re buying a Pixel Slate, you pretty much need a keyboard. And at the moment there are basically two options: Google’s Pixel Slate Keyboard, which connects via the Quick Snap Connector and the Bluetooth Brydge G-Type. While they both have their pros and cons, the Brydge G-Type is a no-brainer.
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https://www.pcworld.com/article/3322914/computers/brydge-g-type-wireless-keyboard-review.html