[Rapid heat accumulation]: Aquarium heater using nickel-chromium heating wire, the heating speed is faster and the thermal conductivity is better. The heating rod comes with 4 strong, fixed and stable suction cups, safe and durable. [External controller]: The digital display screen shows the current temperature and the set temperature in real time, the temperature control accuracy is 1 , and each press raises the temperature by one degree (20~34 ) [Multiple Use Modes]:Due to the strong suction cup, you can fix it inside the tank or put it at the bottom of the tank to use it (Note: Make sure to put it completely in water when you use it, and the bottom of the tank can't be buried by sand and gravel!) [Safety]: Nickel-chromium alloy heating element, high efficiency and energy saving, with explosion-proof quartz tube ant, higher thermal conductivity, faster heating speed, longer service life and even heating, high quality plastic cover, effectively protect aquatic organisms from harm [Perfect for]:This new small aquarium heater is ideal for fresh and salt water, miniature design, small footprint, suitable for water levels as low as 3cm, suitable for aquariums under 50L, more suitable for small aquariums and aquariums of turtles