[2MM Thick Explosion-proof Quartz Tube]The shell of fish tank heater is made of 2MM thick high quality quartz, features insulated, explosion-proof and stable.Double sealing and waterproof, preventing leakage of water and electricity.Much safer for human and your lovely fishes. [Intelligent Temp Control Range 61-90 °F] aquarium heater adopts nickel-chromium heating wire and sensitive silver contacts, features fast heating, high precision of temp control. The heater will power off automatically when reaching the set temp and will start heating again when the water temp is 1°F lower than the set temp. [Easy Installation and Temp Setting]We recommend vertical installation by 2 powerful suction cups or slight tilt, make sure it is fully submerged into water before plug in. Horizontal installation may cause slight deviation of the sensing temperature due to the upward flow of hot water. Rotating the knob to set the target temp. The indicator light will turn red when heating. It is applied for
