In the past, sensors had an LCD display on which you could read the values. That was necessary because values were often not stored. Today there are various modern equivalents, such as a large Android-style screen, a weather station lookalike, or a light that turns green or red.

The Cobra Climate sensor has none of these — and that is a deliberate choice. A few reasons for not wanting a display are:

• It is not always convenient for everyone to see what is on the screen. People may draw incorrect conclusions from the readings — for example, assuming the ventilation is not in order, when in reality a window simply needed to be opened briefly.
• A red or green light can be annoying. Under what circumstances should it turn red? And if you decide to ignore it, will it turn off again afterwards?
• It can break.
• Aesthetics matter. We simply find sensors with lights and displays unattractive.

But above all: it is not necessary. Ultimately, a light or display provides a snapshot and says little about the trends and developments that are relevant to a building manager.

For immediate notifications, there are more modern alternatives that inform exactly the right people at exactly the right time. The Cobra Climate sensor uses configurable push notifications when values exceed set thresholds.