[Fast 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 suction cups, firm and stable, safe and durable. [External Controller]: The digital display shows the current temperature and set temperature in real time, the temperature control accuracy is ±1, and each press increases the temperature by one degree (20~34) [Multiple Usage Modes]: Thanks to the strong suction cup, you can attach it inside the tank or place it on the bottom of the tank for use (Note: Make sure to place it completely in the water when using it, and the bottom of the tank must not be buried by sand and gravel!) [Safety]: Nickel-chromium alloy heating element, high efficiency and energy saving, with explosion-proof quartz tube, higher thermal conductivity, faster heating speed, longer service life and even heating, high-quality plastic protection, effectively protects aquatic organisms from harm [Perfect for]: This new small aquarium heater is ideal for fresh and saltwater, miniature design, small footprint, suitable for water levels as low as 3 cm, suitable for aquariums under 50L, more suitable for small aquariums and turtle tanks