Zacro AH278 Aquarium Heater of 300W with Visible Temperature and Floating Thermometer with Suction Cup (40W) Waterproof and Double sealed material--Plastic and black protective container for Scald-preventing and anti punching. Apply to sea water and fresh water .Easy to install and use. Tank capacity: up to 80 Gallons, Voltage/freq: 110-120volt/60hertz. Visible temperature setting, Temperature adjustable of between 65F - 93F. Provided with an thermometer to show the accurate tank temperature to avoid overheat or freeze.