Features: 1.[Fast Heating] Aquarium heater with built in Al intelligent chip, PID computer control system, intelligent frequency conversion, automatic constant temperature. Titanium alloy stable heat conduction, fast frequency heating, energy saving and safety. 2.[Sensitive Probe] Compact submersible aquarium heater, dual temperature sensitive probe, sensitive detection, abnormal temperature safety. When in working condition, the red light is on, and when stop heating constant temperature state, the blue light is on. 3.[Power Off Out Of Water] Submersible fish tank heater built in power off from the water function, when the heating rod leaves the water, the LED screen will show L1, and keep flashing to remind, while the heater stops heating. 4.[Over Temperature Protection] Built in over temp protection system, when the water temperature exceeds 34, the display HH and flashing reminders, and stop heating, when the water temperature is lower than 15, will prompt LL, low temperature alarm. 5.[Easy To Use] Aquarium heater with outside the tank control, one key cycle, when changing water, please unplug the power switch first, to avoid the residual temperature of the heating body will damage the shell. LED HD display, heating failure at a glance. 6.[Working Principle] Instantaneous burst of heat when the fish tank heating rod starts, rapid heating to the specified temperature, after reaching the specified temperature turn intelligent constant temp mode, suitable for a variety of fish tanks. Specification: Item Type: Submersible Aquarium Heater_x000D_ Material: ABS_x000D_ Use: Fish Tank Heating Rod_x000D_ Power: 100W_x000D_ Temperature Control Range: 15-34_x000D_ Applicable Water Volume: 30L PackageList: 1 x_x000D_ _x000D_ SubmersibleAquariumHeater 2 x Suction Cup Note 1. The heating rod should be completely submerged in water to prevent the rod body from being burned and the protective shell from melting and causing unnecessary trouble._x000D_ 2. Because the heating speed of the heating rod is fast, the heating rod should be placed in the position of rapid water flow to heat the fish tank evenly._x000D_ 3. It is not recommended to use the heating rod in the bottom filter, because the water level of some bottom filters is not enough to soak the rod body, which may lead to accidents to happen._x000D_ 4. Do not bury the heating rod in the sand and soil at the bottom of the fish tank, because the specific heat capacity of sand and stone is different from that of water, which may lead to damage of heating rod._x000D_ 5. The heating rod will be slightly static electricity when working (below 12V) belongs to the safe range, please rest assured to use.