The wire in the model 300 is 1.5-2 meters. I won't say exactly. Its pros: Well assembled, there are no fragile parts that you are afraid to break in operation. At night, if a fish swims in front of the temperature indicator, its large shadow silhouette will float on the wall the size of a plate. In principle, it can be turned off if it interferes, anyway the temperature will be exactly what you set, the accuracy of the digital thermometer is 0.4 degrees. But the indicator is convenient, if the temperature is less than the one you set, then let's say a light will run from 22 to 26 degrees. Got cons: In the photo, something like a raid after 1.5 years of use, it was initially clear that there was water or glue inside. In principle, it works, check before buying for the presence of water in the flask.
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