[2mm thick explosion-proof quartz tube] The shell of the aquarium heater is made of high-quality 2mm thick quartz, insulated, explosion-proof and stable. Double sealing and waterproof, preventing leakage water and electricity Much safer for human and your beautiful fish. [Intelligent temperature control range 61-90°F] The aquarium heater adopts nickel-chromium heating wire and sensitive silver contacts, features fast heating, high control precision of the temperature. The heater will automatically turn off when it reaches the set temperature and start heating again when the water temperature is 1°F lower than the set temperature. [Easy Installation and Temperature Adjustment] We recommend vertical installation with 2 strong suction cups or a slight tilt, make sure it is fully submerged in water before plugging in. Horizontal installation may cause a slight deviation of the detection temperature due to the upward flow of hot water. Turn the knob to set the target temperature. The light
