1. Precise Temperature Control: An intelligent IC chip controls the heaters temperature, keeping the temperature difference within 0.5/1F; It provides living environment for your aquatic creatures 2. Aquarium Heater:and a plastic tube material that features explosion-proof and anti-corrosion engineering, which makes this submersible heater more resistant to damage while heating better than traditional glass heaters; Built with overheat and water shortage protection 3. External Temperature Controller: The touch-button controller adjusts the temperature without getting your hands wet; Its easy to control the temp from 18C to /34C; Check the size chart to find your desired fish tank heater Product: Aquarium / fish tank automatic constant temperature heating rod Material: plastic+PTC Color: as shown Temperature range: 18-34 Voltage: 220-240v Power: 50W / 100W / 200W / 300W / 500W/800W/1000W