NEWATT PRO Entirely submersible heating system for aquariums Made with very efficient heating elements, it guarantees completely safe running thanks to the unbreakable tube and electronic control of the set temperature. The pilot lamp indicates that the heating is running. The temperature scale on the cap is used to regulate the heating easily and precisely without taking it out of the water. The strong points of this device Temperature scale to facilitate regulation and temperature readout. Electronic control of the set temperature: RED PILOT LAMP: Heater running GREEN PILOT LAMP: Temperature reached Featuring: Automatic shutdown and restart in the event of dry running to ensure the safety and longevity of the heating system. Tube resistant to mechanical and thermal shock. Internal cylinder in aluminium for uniform heat distribution.