It comes in 5,000 mAh and 10,000 mAh variants and will use 95% of the battery in power bank mode and reserve the bottom 5% to run the mesh node. I think you can run the mesh node and use all 100% of the battery if you wish, but the power bank mode can only use 95% of it. I think it's based on the NRF52 and SX1262 radio.

Edit: Sorry for the duplicate post. Please feel free to delete it, because I can't figure out how to.