Aquael Comfortzone Fix 2 - small automatic heater. The new Comfortzone Fix 2 heaters are fully automatic devices that maintain a constant water temperature of 25 °C (± 0.5 °C). The device automatically turns on and off, with its duration and frequency depending on the temperature conditions in the aquarium. Another advantage is their relatively small size compared to traditional glass heaters. Due to their size, the heaters can be easily installed in smaller aquariums. The Fix 2 line features a special light indicator that shows whether the temperature is too low or too high compared to the 25 degrees for which this heater is factory calibrated. Light indicators: The light blinks slowly, indicating the temperature is below 25 degrees and is currently being raised. The light is on – the temperature in the aquarium is stable at 25 degrees. It blinks quickly - the temperature in the aquarium exceeds 25 degrees (possibly due to a hot summer day or other reasons). Suitable for aquariums of 50-100 liters. Heater length: 21 mm. Warranty: 2 years.