There are two blade options:
For a clean smooth shave (0.05mm), use the curved edge foil blade head.
For a comfortable trim (0.5mm), use the curved edge ceramic blade head.
It is recommended to change once every 3 months for hygiene purpose.
It is IPX6 Waterproof rated and therefore it is safe for you to wash your blades and the head of the shaver under running water.