Note: This article lists the technical specifications of the FIDO U2F Security Key. If you're looking for setup instructions for your Security Key, see https://www.yubico.com/start.
The FIDO U2F Security Key is FIDO Certified and provides the U2F application which is used by many popular services including Google, Dropbox, Facebook, Github, Dashlane, Duo, and many more.
The FIDO U2F Security Key uses a USB 2.0 interface.
The U2F application can hold an unlimited number of U2F credentials and is FIDO certified.
Dimensions: 18mm x 45mm x 3.3mm
Operational range: 0 °C to 40 °C (32 °F to 104 °F)
Storage range: -20 °C to 85 °C (-4 °F to 185 °F)