Feature: 1. PID TEMPERATURE CONTROL ALGORITHM: PID temperature control algorithm, to achieve high heat, low power consumption, the use of intelligent frequency conversion technology, power size is freely adjusted by the chip, soft temperature control. 2. SAFE AND STABLE: Aquarium heater is filled with silicon carbide sand, safe and stable, fast heat conduction, high purity nitinol wire, thickened heat transfer, faster heating and more energy saving. 3. IPX6 WATERPROOF: Aquarium frequency conversion heater adopts IPX6 waterproof grade, high safety performance, built in accurate dual temperature sensing probe, always monitor the aquarium, safety is guaranteed. 4. EXTERNAL TEMPERATURE CONTROL: External temperature adjustment, one key cycle, safe and convenient, temperature display Celsius and Fahrenheit can be switched, you can long press the temperature adjustment key for 5 seconds to switch. 5. HIGH DEFINITION LED DISPLAY: Fish tank frequency conversion heater with HD LED display, accurately monitor the temperature day and night, real time easy to grasp the current fish tank temperature. 6. FAST HEATING SPEED: Fast heating speed, try to place it in the position of rapid water flow, so that the fish tank is evenly heated. Completely submerged underwater when in use, to prevent burning the rod body, burning melting the protective shell and so on. Specification: Item Type: Aquarium Frequency Conversion Heater Material: ABS Use: Fish Tank Automatic Thermostat Suitable for Water Volume: Below 600L Suitable for Fish Tank: Approx. 120-150cm / 47.2-59.1in. Package List: 1 x Aquarium Frequency Conversion Heater2 x Suction Cup