Use Only What You Need
This product's purpose is to grow your awareness of water usage.
A person takes an average of 12 minutes to shower and consumes between 80-120 liters of water when in practice he should not take more than 7 minutes to shower
You just plug in the module to your hand shower, and it gives you an indication of how much water you used while taking a shower by turning on four led strips each at a time.
If the last led is on, it means you used enough water, and its time to stop.