The SOBO slim Hang On Back Filter is a sleek and efficient solution to to your aquariums cleanliness and water clarity. This filters combine mechanical, biological and chemical filtration and ensure a comprehensive cleaning process. Models: WP-618H: AC220-240V 50/60HZ POWER 5W F.MAX 280L/H WP-628H: AC220-240V 50/60HZ POWER 6W F.MAX 400L/H WP-638H: AC220-240V 50/60HZ POWER 6,8W F.MAX 500L/H