Does not need to eat, sleep (although most do need to recharge their batteries at certain intervals), or breathe, and are unaffected by toxins or poisons.
Do not gain the benefits of recovering with Medicine skill checks. They do still recover naturally by resting, as their systems attempt to self-repair. Otherwise, they need to be tended to with a Mechanics check, using the same difficulties and results of medical checks for organic beings. Painkillers can be used to repair damage but consistently heal 3 Wounds and can be used a maximum of 5 times per long rest.