Temperature Adjustable - Adjustable temperature range is 59-93°F / 15-34 °C, which is suitable for various ornamental fish and amphibious turtles. Essential for arowana, aquarium fish, fish ponds, and turtles. Over temperature protection - When the water temperature exceeds 36 °C, the displays “超温” icon flashes and alarm, the heating body automatically cuts off, and the water temperature recovers when it is normal. Automatically power off when leave water - When the heater leaves the water surface, the display “离水” icon flashes, the heater automatically cuts off, prevents the body from malfunctioning. Easy Viewing & Safe Adjusting - It is easy and safe to adjust temperature by the external controller and the temperature will be shown on the LED screen of the heater. Submersible Heater - Our Fish Tank Heater is fully submersible in water. Place it near a strong water flow so that the whole aquarium at the same temperature.