HP Advanced keyboard base 850487-051 is a French regional keyboard base for the HP Elite x2 1012 G1. It adds a physical full-sized keyboard for typing with the tablet and is designed to attach as a keyboard base.
The keys are backlit and have a DuraKey coating. The base uses microfiber material and includes integrated NFC technology and a Smart Card slot. HP describes the keyboard base connecting to the tablet through a POGO pin connector.
This is the Advanced keyboard base variant, with the France designation.