Figment.io staking through ledger questions

I don't know if this is the correct place to post this. I posted in r/ethstaker and havent gotten any discussion going yet.

Does anyone know how figment.io stakes your ethereum non-custodial? I was trying to look for resources on: exactly how eth staking works Then how does figment.io stake for you while you still control the private keys etc? How does this work?

What are the risks associated with going this route?

Im not looking for a guide on how to do this. I want to know how this works.

Thank you all!