🐟【Fast Heating Aquarium Heater:】200W aquarium heater is desinged for 26-52 gallon tank. The tank heater resistant and explosion-proof quartz tube and 304 stainless steel are used as heating parts, which have fast heating speed and heat preservation resistance. Make your fish will be no longer afraid of winter..🐟【Quartz Fish Tank Heater:】Submersible aquarium heater is made of high quality quartz glass and stainless steel material,Have IP68 waterproof, explosion-proof and anti-corrosion make it stronger than normal glass and quartz aquarium heaters..🐟【Safety Guarantee:】With anti-dry heating protection and overheating protection, when the water temperature exceeds 95℉, the controller will auto shut off and alert to prevent over heating. When the submersible heater is not completely immersed in water,the tank heater still will be shut off and led controller display will be come up "E1".Perfect to protect your fish and pets safe..🐟【External Controller:】Woliver aquarium water heater with external IC + PID temperature controller,made you easy to adjust the temperater.Temp range:63-94℉/17-34℃(Long press for 3 seconds can convert the unit from ℉ to ℃).Temp accuracy: ±1°F (Auto shut off when over-heats, resets when it cools down)..🐟【WIDE APPLICATION:】Suitable for freshwater and saltwater aquariums tank. NOTE: Before you clean the aquarium or change water, please cut off the heater power,then after 10-15 minutes cooling to take out the heater. Woliver provide 12 Month Warranty and 24 Hour Professional After-sales Service. Please don't hesitate to contact us to get help.