Additional Options
These are the upgrades that sit outside the standard customisation list. Robotic functions, ROS heads, oral heating, movable eyelids, self-lubricating vaginas and the jitter upgrades.
They have two things in common: they are expensive, and they contain electronics or mechanisms with a finite lifespan. Manufacturers typically quote around two years of use for the powered functions. That doesn't make them bad choices, but it should shape how you value them.
Every powered option adds something that can fail, and most of them can't be retro-fitted or removed later. Read the page for any upgrade you're considering in full, including what happens to the doll when the mechanism eventually stops working.
Availability varies more here than anywhere else in the knowledge base, and is often limited to particular brands or particular bodies.