[Precise Temperature Control]: LED digital display, large screen LED temperature display, aquarium heating rod, easy to read temperature. The external controller enables the outside temperature to be set safely. Adjustable temperature range of 18-34°C (64.4-94°F). [Thicker Explosion-proof Quartz Glass]: Using stable and reliable high quality materials, 30% thicker than normal aquarium heater, anti-explosion and prevent electricity leakage. Made of high temperature resistant material, the protective shell will not soften under high temperature, it can prevent your beloved fish from being punctured and scalded. [Unique safety protection design]: The thermostatic aquarium heater adopts 3 sensors, better protection when the water temperature is higher than the set temperature, the heater will automatically stop heating. When the water temperature is lower than the set temperature, the heater will start heating automatically. Stage heater, the temperature rises gradually, which can prevent