The ring base of the seat is also made with the same technology so that the seat does not move while your child is using it. (checkpregnancy.com)
Align the two bars on base of the seat with the two hooks on the base as you place the car seat on top of the base. (howtoadult.com)
The rotating base of this seat comes out of the car once the toddler seat faces forward and the seat installs with either a latch belt or a seat belt. (bumpclubandbeyond.com)