Product Description High Quality, Break Resistant Quartz Glass Construction Fully Submersible Simple Installation Available In A Variety Of Sizes Suction Cups For Securing To The Aquarium Visible Temperature Setting For Use In Fresh And Saltwater Amazon.com Feature High Quality, Break Resistant Quartz Glass Construction Fully Submersible Simple Installation Available In A Variety Of Sizes Suction Cups For Securing To The Aquarium Visible Temperature Setting For Use In Fresh And Saltwater Models Part List Temperature Adjustment Waterproof Double Insulation Temperature Setting Water Level Line Power Lamp(Indicate ON/OFF Cycle) Heating Element Ceramic Heater Core (Evenly dispersed Heat)