Feature: 1. Rapid Heating: This submersible aquarium heater can heat up and adjust water temperature quickly, which is suitable for medium and small aquarium, reptile tank and fish tank. 2. Intelligent Temp Control Chip: This mini fish tank heater is designed with intelligent temperature control chip. When the water temperature is too high or too low, the heater will automatically heat up or stop working. 3. Easy Operation: This smart aquarium heater is equipped with external controller which can be easily operated, press the button for 5 seconds to switch temperature display mode(℃ and ℉). 4. Quartz Glass Tube: This fish aquarium heater has inbuilt explosion proof quartz glass tube, which is safe, durable and resistant to high temperature. All in one sealed plastic prevents electric leakage and other potential dangers. 5. High Accuracy: This fish tank mini heating rod adopts precise temperature sensing probe that can precisely monitor real time temperature, safe and reliable. Specification: Item Type: Submersible Aquarium Heater Material: ABS Uses: Low Water Heating Rod for Aquarium, Reptile Tank, Fish Tank Temperature Control Range: 15 To 34℃ Applicable Water Volume: Within 40L. Package List: 1 x Submersible Aquarium Heater2 x Suction Cups