This looks similar to the Feitan Bluetooth LE-compatible key they also recommend that you purchase if you enable their Advanced Protection feature on your Google account:
It makes clear that there will in fact be two separate styles. It also includes a comment from Yubico that Bluetooth "does not provide the security assurance levels of NFC and USB, and requires batteries and pairing that offer a poor user experience."
They're not wrong on the poor UX. I have the Feitan BLE key, along with about three Yubico U2F keys (I'm paranoid about losing them).
You'd think you could wirelessly use the Bluetooth key with a laptop, but you can't. You need to connect a MicroUSB cord to the bottom of the key, plug it into your computer, and use it like you would a USB key.
While I could pair the key with my iPad and my Pixel phone, I couldn't with my Mac. So keeping the BLE key on my keychain rather than a USB version is kind of pointless, because I would need a cord lying around.
I keep the BLE key in a desk drawer for the purpose of authing my mobile devices as it's pretty much the only way to auth on iOS, and once you've used the key with Google's Smart Lock iOS app to add your Google account you don't need the key again. I don't take it anywhere with me.
https://www.amazon.com/Feitian-ePass-NFC-FIDO-Security/dp/B0...