Description Smart Control- Adopted intelligent circuit board, with a precise temperature sensing probe and constant temperature heating system. No thermometer required, no more operations: Unlike other conventional heaters, need you to manually adjust the temperature. Our Smart Aquarium Heater just plug the power cable then it will work. It works in intermittent operation mode and will automatically turn on/off to achieve the setting temperature constantly and stably, Energy-efficient. Easier to Use- Mini Heater different from a manually adjusted heater. Our heater automatic temperature regulate on 25 (77F), no need to set. Prevent electric shock and burns. Keep you and your family safe. Position it near a strong water flow for whole aquarium are in the same temperature. The outlet of filter is ideal. High Quality- Made by heat resistant ABS housing, sandy quartz filler and MCH Alumina ceramic heating system, anti explosion cracking, it is scald-preventing for your pets and safe operation for you, safer and more stable to use. Mini Sized- Fully submersible compact heater Gift with 3PCS Aquarium Decor Artificial Plant. Specific perfect for mini aquarium under 5 gal/20L. Mini Heater provide a constant warm for your pet fish to stay healthy, suitable both for fresh and salt water.