Fluval is a world leader in quality aquatic products, for over 30 years, it has earned the trust of fish-hobbyists by making innovative products that deliver many valuable benefits and has earned a global reputation for excellence in product innovation and dependability.Fluval M Premium Aquarium Heater is quality manufactured in Europe using superior components and construction.Sleek and compact in design, the submersible heater provides exceptional performance and unsurpassed reliability.The heater also includes an exclusive mirror technology that reflects the colours of the aquarium and enhances overall aesthetics.Key Features include: A quality heater made in Europe using superior components and construction, Sleek and compact, Submersible heater provides exceptional performance and unsurpassed reliability, Also includes an exclusive mirror technology that reflects the colours of the aquarium, enhances overall aesthetics.M50 is ideal for 50 Litre (15 US gal) aquariums, For fresh and saltwater tanks. Approximate Dimensions (Product): 5.5 x 33 x 9cmM150 is ideal for 150 Litre (45 US gal) aquariums, For fresh and saltwater tanks. Approximate Dimensions (Product): 33 x 2.5 x 2.5 cmPlease note: The M150 comes only in a cardboard sleeve (usually sold as a spare.)