Submerged aquarium heater, complete with a free protective shield. This heater has a very sensitive and reliable thermostat to ensure a constant temperature. The temperature setting knob is at the top of the heater for especially convenient adjustment. The 2.3-mm safety glass and protective shield, along with GS approval, make the heater especially safe in use. The heater has an extra-long cable (1.5 m in the small models and 2 m in the large models) for convenient installation and comes with a 2-year warranty.