🐟🐟🐟 300W Submersible Aquarium Heater is Suitable for 20-80 Gallon. Safety: Ul-Approved Power Cord, SCR Switch Chips, Multiple Protection Design To Ensure Safety And Reliability,Inductively Power Off When Out Of The Water Or Automatically Cut Off The Power When The Temperature Exceeds 36 Degrees Celsius.🐟🐟🐟 Design External Temperature Control System:It Is Possible To Control The Temperature Without Taking Out The Heating Rod Or Reaching Into The Water. The Dual CPU Temperature Control System Is More Reliable.🐟🐟🐟 Appearance: External Customized Quartz Tube, Internal Use Of White Corundum As Heat Transfer Medium, Reduce Heat Loss, Smaller Size And More Beautiful,Add Unique Design Of Anti-Scalding Shell.🐟🐟🐟 Parameters: 50W -300W Optional Aquarium Heater For 55-95 Gallon Tanks, Temperature Can Be Adjusted In The 24-32 Degree Range.🐟🐟🐟 Please Notice that the aquarium heater only heater when the temperature of the aquarium is lower than your Setting Temperature, and only work when the pointer points to the number (not Blank Area). Warranty:365 Days Guarantee, No Need To Return, Directly Send You A New Aquarium Heater.